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Finding the Fourth Proportional to 869.86, 1,304.88 and 292.78

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Solution

The fourth proportional to 869.86, 1,304.88 and 292.78 is: 439.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.86 : 1,304.88 = 292.78 : x
  2. Step 2: Convert to fraction form
    869.86/1,304.88 = 292.78/x
  3. Step 3: Cross multiply
    869.86x = 1,304.88 × 292.78
  4. Step 4: Simplify right side
    869.86x = 382,039.50
  5. Step 5: Solve for x
    x = 382,039.50/869.86
  6. Step 6: Final answer
    x = 439.20

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Double scale
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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.