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Finding the Fourth Proportional to 971.72, 1,459.56 and 643.68

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Solution

The fourth proportional to 971.72, 1,459.56 and 643.68 is: 966.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.72 : 1,459.56 = 643.68 : x
  2. Step 2: Convert to fraction form
    971.72/1,459.56 = 643.68/x
  3. Step 3: Cross multiply
    971.72x = 1,459.56 × 643.68
  4. Step 4: Simplify right side
    971.72x = 939,489.58
  5. Step 5: Solve for x
    x = 939,489.58/971.72
  6. Step 6: Final answer
    x = 966.83

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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.