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Finding the Fourth Proportional to 782.66, 1,080.34 and 520.62

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Solution

The fourth proportional to 782.66, 1,080.34 and 520.62 is: 718.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.66 : 1,080.34 = 520.62 : x
  2. Step 2: Convert to fraction form
    782.66/1,080.34 = 520.62/x
  3. Step 3: Cross multiply
    782.66x = 1,080.34 × 520.62
  4. Step 4: Simplify right side
    782.66x = 562,446.61
  5. Step 5: Solve for x
    x = 562,446.61/782.66
  6. Step 6: Final answer
    x = 718.63

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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.