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Finding the Fourth Proportional to 916.39, 1,264.98 and 543.70

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Solution

The fourth proportional to 916.39, 1,264.98 and 543.70 is: 750.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.39 : 1,264.98 = 543.70 : x
  2. Step 2: Convert to fraction form
    916.39/1,264.98 = 543.70/x
  3. Step 3: Cross multiply
    916.39x = 1,264.98 × 543.70
  4. Step 4: Simplify right side
    916.39x = 687,769.63
  5. Step 5: Solve for x
    x = 687,769.63/916.39
  6. Step 6: Final answer
    x = 750.52

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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.