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Finding the Fourth Proportional to 1,057.62, 1,459.74 and 615.78

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Solution

The fourth proportional to 1,057.62, 1,459.74 and 615.78 is: 849.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,057.62 : 1,459.74 = 615.78 : x
  2. Step 2: Convert to fraction form
    1,057.62/1,459.74 = 615.78/x
  3. Step 3: Cross multiply
    1,057.62x = 1,459.74 × 615.78
  4. Step 4: Simplify right side
    1,057.62x = 898,878.70
  5. Step 5: Solve for x
    x = 898,878.70/1,057.62
  6. Step 6: Final answer
    x = 849.91

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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.