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Finding the Fourth Proportional to 916.99, 1,265.56 and 543.78

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Solution

The fourth proportional to 916.99, 1,265.56 and 543.78 is: 750.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.99 : 1,265.56 = 543.78 : x
  2. Step 2: Convert to fraction form
    916.99/1,265.56 = 543.78/x
  3. Step 3: Cross multiply
    916.99x = 1,265.56 × 543.78
  4. Step 4: Simplify right side
    916.99x = 688,184.86
  5. Step 5: Solve for x
    x = 688,184.86/916.99
  6. Step 6: Final answer
    x = 750.48

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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.