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Finding the Fourth Proportional to 720.35, 1,078.64 and 472.77

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Solution

The fourth proportional to 720.35, 1,078.64 and 472.77 is: 707.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.35 : 1,078.64 = 472.77 : x
  2. Step 2: Convert to fraction form
    720.35/1,078.64 = 472.77/x
  3. Step 3: Cross multiply
    720.35x = 1,078.64 × 472.77
  4. Step 4: Simplify right side
    720.35x = 509,948.04
  5. Step 5: Solve for x
    x = 509,948.04/720.35
  6. Step 6: Final answer
    x = 707.92

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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.