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Finding the Fourth Proportional to 720.24, 1,078.18 and 651.78

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Solution

The fourth proportional to 720.24, 1,078.18 and 651.78 is: 975.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.24 : 1,078.18 = 651.78 : x
  2. Step 2: Convert to fraction form
    720.24/1,078.18 = 651.78/x
  3. Step 3: Cross multiply
    720.24x = 1,078.18 × 651.78
  4. Step 4: Simplify right side
    720.24x = 702,736.16
  5. Step 5: Solve for x
    x = 702,736.16/720.24
  6. Step 6: Final answer
    x = 975.70

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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.