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Finding the Fourth Proportional to 782.76, 1,080.10 and 446.61

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Solution

The fourth proportional to 782.76, 1,080.10 and 446.61 is: 616.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.76 : 1,080.10 = 446.61 : x
  2. Step 2: Convert to fraction form
    782.76/1,080.10 = 446.61/x
  3. Step 3: Cross multiply
    782.76x = 1,080.10 × 446.61
  4. Step 4: Simplify right side
    782.76x = 482,383.46
  5. Step 5: Solve for x
    x = 482,383.46/782.76
  6. Step 6: Final answer
    x = 616.26

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Find fourth proportional to 391.38, 540.05 and 223.31
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.