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Finding the Fourth Proportional to 691, 953.60 and 458.16

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Solution

The fourth proportional to 691, 953.60 and 458.16 is: 632.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    691 : 953.60 = 458.16 : x
  2. Step 2: Convert to fraction form
    691/953.60 = 458.16/x
  3. Step 3: Cross multiply
    691x = 953.60 × 458.16
  4. Step 4: Simplify right side
    691x = 436,901.38
  5. Step 5: Solve for x
    x = 436,901.38/691
  6. Step 6: Final answer
    x = 632.27

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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.