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Finding the Fourth Proportional to 720.66, 1,080.99 and 478.74

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Solution

The fourth proportional to 720.66, 1,080.99 and 478.74 is: 718.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.66 : 1,080.99 = 478.74 : x
  2. Step 2: Convert to fraction form
    720.66/1,080.99 = 478.74/x
  3. Step 3: Cross multiply
    720.66x = 1,080.99 × 478.74
  4. Step 4: Simplify right side
    720.66x = 517,513.15
  5. Step 5: Solve for x
    x = 517,513.15/720.66
  6. Step 6: Final answer
    x = 718.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.