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Finding the Fourth Proportional to 916.23, 1,373.13 and 428.21

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Solution

The fourth proportional to 916.23, 1,373.13 and 428.21 is: 641.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.23 : 1,373.13 = 428.21 : x
  2. Step 2: Convert to fraction form
    916.23/1,373.13 = 428.21/x
  3. Step 3: Cross multiply
    916.23x = 1,373.13 × 428.21
  4. Step 4: Simplify right side
    916.23x = 587,981.13
  5. Step 5: Solve for x
    x = 587,981.13/916.23
  6. Step 6: Final answer
    x = 641.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.