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Finding the Fourth Proportional to 1,035.36, 1,428.75 and 615.73

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Solution

The fourth proportional to 1,035.36, 1,428.75 and 615.73 is: 849.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,035.36 : 1,428.75 = 615.73 : x
  2. Step 2: Convert to fraction form
    1,035.36/1,428.75 = 615.73/x
  3. Step 3: Cross multiply
    1,035.36x = 1,428.75 × 615.73
  4. Step 4: Simplify right side
    1,035.36x = 879,724.24
  5. Step 5: Solve for x
    x = 879,724.24/1,035.36
  6. Step 6: Final answer
    x = 849.68

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.