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Finding the Fourth Proportional to 1,038.70, 1,557.87 and 518.15

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Solution

The fourth proportional to 1,038.70, 1,557.87 and 518.15 is: 777.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.70 : 1,557.87 = 518.15 : x
  2. Step 2: Convert to fraction form
    1,038.70/1,557.87 = 518.15/x
  3. Step 3: Cross multiply
    1,038.70x = 1,557.87 × 518.15
  4. Step 4: Simplify right side
    1,038.70x = 807,202.55
  5. Step 5: Solve for x
    x = 807,202.55/1,038.70
  6. Step 6: Final answer
    x = 777.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.