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Finding the Fourth Proportional to 782.76, 1,079.90 and 487.52

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Solution

The fourth proportional to 782.76, 1,079.90 and 487.52 is: 672.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.76 : 1,079.90 = 487.52 : x
  2. Step 2: Convert to fraction form
    782.76/1,079.90 = 487.52/x
  3. Step 3: Cross multiply
    782.76x = 1,079.90 × 487.52
  4. Step 4: Simplify right side
    782.76x = 526,472.85
  5. Step 5: Solve for x
    x = 526,472.85/782.76
  6. Step 6: Final answer
    x = 672.59

Related Problems

Find fourth proportional to 391.38, 539.95 and 243.76
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.