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Finding the Fourth Proportional to 782.61, 1,080.06 and 520.44

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Solution

The fourth proportional to 782.61, 1,080.06 and 520.44 is: 718.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.61 : 1,080.06 = 520.44 : x
  2. Step 2: Convert to fraction form
    782.61/1,080.06 = 520.44/x
  3. Step 3: Cross multiply
    782.61x = 1,080.06 × 520.44
  4. Step 4: Simplify right side
    782.61x = 562,106.43
  5. Step 5: Solve for x
    x = 562,106.43/782.61
  6. Step 6: Final answer
    x = 718.25

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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.