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Finding the Fourth Proportional to 1,038.15, 1,557.52 and 307.74

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Solution

The fourth proportional to 1,038.15, 1,557.52 and 307.74 is: 461.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.15 : 1,557.52 = 307.74 : x
  2. Step 2: Convert to fraction form
    1,038.15/1,557.52 = 307.74/x
  3. Step 3: Cross multiply
    1,038.15x = 1,557.52 × 307.74
  4. Step 4: Simplify right side
    1,038.15x = 479,315.09
  5. Step 5: Solve for x
    x = 479,315.09/1,038.15
  6. Step 6: Final answer
    x = 461.70

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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.