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Finding the Fourth Proportional to 868.68, 1,302.80 and 381.64

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Solution

The fourth proportional to 868.68, 1,302.80 and 381.64 is: 572.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.68 : 1,302.80 = 381.64 : x
  2. Step 2: Convert to fraction form
    868.68/1,302.80 = 381.64/x
  3. Step 3: Cross multiply
    868.68x = 1,302.80 × 381.64
  4. Step 4: Simplify right side
    868.68x = 497,200.59
  5. Step 5: Solve for x
    x = 497,200.59/868.68
  6. Step 6: Final answer
    x = 572.36

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1.5x scale

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.