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Finding the Fourth Proportional to 1,539.88, 2,124.96 and 876.76

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Solution

The fourth proportional to 1,539.88, 2,124.96 and 876.76 is: 1,209.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.88 : 2,124.96 = 876.76 : x
  2. Step 2: Convert to fraction form
    1,539.88/2,124.96 = 876.76/x
  3. Step 3: Cross multiply
    1,539.88x = 2,124.96 × 876.76
  4. Step 4: Simplify right side
    1,539.88x = 1,863,079.93
  5. Step 5: Solve for x
    x = 1,863,079.93/1,539.88
  6. Step 6: Final answer
    x = 1,209.89

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Half scale
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Double scale
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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.