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Finding the Fourth Proportional to 691.34, 1,036.47 and 325.94

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Solution

The fourth proportional to 691.34, 1,036.47 and 325.94 is: 488.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.34 : 1,036.47 = 325.94 : x
  2. Step 2: Convert to fraction form
    691.34/1,036.47 = 325.94/x
  3. Step 3: Cross multiply
    691.34x = 1,036.47 × 325.94
  4. Step 4: Simplify right side
    691.34x = 337,827.03
  5. Step 5: Solve for x
    x = 337,827.03/691.34
  6. Step 6: Final answer
    x = 488.66

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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.