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Finding the Fourth Proportional to 1,038.80, 1,557.12 and 461

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Solution

The fourth proportional to 1,038.80, 1,557.12 and 461 is: 691.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.80 : 1,557.12 = 461 : x
  2. Step 2: Convert to fraction form
    1,038.80/1,557.12 = 461/x
  3. Step 3: Cross multiply
    1,038.80x = 1,557.12 × 461
  4. Step 4: Simplify right side
    1,038.80x = 717,832.32
  5. Step 5: Solve for x
    x = 717,832.32/1,038.80
  6. Step 6: Final answer
    x = 691.02

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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.