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Finding the Fourth Proportional to 916.13, 1,264.04 and 543.21

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Solution

The fourth proportional to 916.13, 1,264.04 and 543.21 is: 749.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.13 : 1,264.04 = 543.21 : x
  2. Step 2: Convert to fraction form
    916.13/1,264.04 = 543.21/x
  3. Step 3: Cross multiply
    916.13x = 1,264.04 × 543.21
  4. Step 4: Simplify right side
    916.13x = 686,633.75
  5. Step 5: Solve for x
    x = 686,633.75/916.13
  6. Step 6: Final answer
    x = 749.49

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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.