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Finding the Fourth Proportional to 760.21, 1,049.10 and 445.40

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Solution

The fourth proportional to 760.21, 1,049.10 and 445.40 is: 614.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.21 : 1,049.10 = 445.40 : x
  2. Step 2: Convert to fraction form
    760.21/1,049.10 = 445.40/x
  3. Step 3: Cross multiply
    760.21x = 1,049.10 × 445.40
  4. Step 4: Simplify right side
    760.21x = 467,268.66
  5. Step 5: Solve for x
    x = 467,268.66/760.21
  6. Step 6: Final answer
    x = 614.66

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Double scale
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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.