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Finding the Fourth Proportional to 500.79, 691.04 and 291.04

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Solution

The fourth proportional to 500.79, 691.04 and 291.04 is: 401.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.79 : 691.04 = 291.04 : x
  2. Step 2: Convert to fraction form
    500.79/691.04 = 291.04/x
  3. Step 3: Cross multiply
    500.79x = 691.04 × 291.04
  4. Step 4: Simplify right side
    500.79x = 201,117.10
  5. Step 5: Solve for x
    x = 201,117.10/500.79
  6. Step 6: Final answer
    x = 401.60

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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.