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Finding the Fourth Proportional to 916.55, 1,264.64 and 543.34

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Solution

The fourth proportional to 916.55, 1,264.64 and 543.34 is: 749.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.55 : 1,264.64 = 543.34 : x
  2. Step 2: Convert to fraction form
    916.55/1,264.64 = 543.34/x
  3. Step 3: Cross multiply
    916.55x = 1,264.64 × 543.34
  4. Step 4: Simplify right side
    916.55x = 687,123.62
  5. Step 5: Solve for x
    x = 687,123.62/916.55
  6. Step 6: Final answer
    x = 749.69

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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.