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Finding the Fourth Proportional to 916.84, 1,265.12 and 543.76

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Solution

The fourth proportional to 916.84, 1,265.12 and 543.76 is: 750.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.84 : 1,265.12 = 543.76 : x
  2. Step 2: Convert to fraction form
    916.84/1,265.12 = 543.76/x
  3. Step 3: Cross multiply
    916.84x = 1,265.12 × 543.76
  4. Step 4: Simplify right side
    916.84x = 687,921.65
  5. Step 5: Solve for x
    x = 687,921.65/916.84
  6. Step 6: Final answer
    x = 750.32

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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.