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Finding the Fourth Proportional to 1,057.78, 1,459.38 and 615.32

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Solution

The fourth proportional to 1,057.78, 1,459.38 and 615.32 is: 848.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,057.78 : 1,459.38 = 615.32 : x
  2. Step 2: Convert to fraction form
    1,057.78/1,459.38 = 615.32/x
  3. Step 3: Cross multiply
    1,057.78x = 1,459.38 × 615.32
  4. Step 4: Simplify right side
    1,057.78x = 897,985.70
  5. Step 5: Solve for x
    x = 897,985.70/1,057.78
  6. Step 6: Final answer
    x = 848.93

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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.