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Finding the Fourth Proportional to 869.85, 1,200.39 and 476.87

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Solution

The fourth proportional to 869.85, 1,200.39 and 476.87 is: 658.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.85 : 1,200.39 = 476.87 : x
  2. Step 2: Convert to fraction form
    869.85/1,200.39 = 476.87/x
  3. Step 3: Cross multiply
    869.85x = 1,200.39 × 476.87
  4. Step 4: Simplify right side
    869.85x = 572,434.77
  5. Step 5: Solve for x
    x = 572,434.77/869.85
  6. Step 6: Final answer
    x = 658.09

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1.5x scale

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.