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Finding the Fourth Proportional to 691.79, 954.68 and 397.05

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Solution

The fourth proportional to 691.79, 954.68 and 397.05 is: 547.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.79 : 954.68 = 397.05 : x
  2. Step 2: Convert to fraction form
    691.79/954.68 = 397.05/x
  3. Step 3: Cross multiply
    691.79x = 954.68 × 397.05
  4. Step 4: Simplify right side
    691.79x = 379,053.71
  5. Step 5: Solve for x
    x = 379,053.71/691.79
  6. Step 6: Final answer
    x = 547.94

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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.