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Finding the Fourth Proportional to 869.24, 1,199.55 and 470.90

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Solution

The fourth proportional to 869.24, 1,199.55 and 470.90 is: 649.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.24 : 1,199.55 = 470.90 : x
  2. Step 2: Convert to fraction form
    869.24/1,199.55 = 470.90/x
  3. Step 3: Cross multiply
    869.24x = 1,199.55 × 470.90
  4. Step 4: Simplify right side
    869.24x = 564,862.74
  5. Step 5: Solve for x
    x = 564,862.74/869.24
  6. Step 6: Final answer
    x = 649.84

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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.