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Finding the Fourth Proportional to 778.61, 1,072.16 and 557.18

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Solution

The fourth proportional to 778.61, 1,072.16 and 557.18 is: 767.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.61 : 1,072.16 = 557.18 : x
  2. Step 2: Convert to fraction form
    778.61/1,072.16 = 557.18/x
  3. Step 3: Cross multiply
    778.61x = 1,072.16 × 557.18
  4. Step 4: Simplify right side
    778.61x = 597,385.64
  5. Step 5: Solve for x
    x = 597,385.64/778.61
  6. Step 6: Final answer
    x = 767.24

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1.5x scale

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.