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Finding the Fourth Proportional to 778.88, 1,072.98 and 654.55

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Solution

The fourth proportional to 778.88, 1,072.98 and 654.55 is: 901.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.88 : 1,072.98 = 654.55 : x
  2. Step 2: Convert to fraction form
    778.88/1,072.98 = 654.55/x
  3. Step 3: Cross multiply
    778.88x = 1,072.98 × 654.55
  4. Step 4: Simplify right side
    778.88x = 702,316.38
  5. Step 5: Solve for x
    x = 702,316.38/778.88
  6. Step 6: Final answer
    x = 901.70

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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.