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Finding the Fourth Proportional to 726.78, 1,002.72 and 427.93

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Solution

The fourth proportional to 726.78, 1,002.72 and 427.93 is: 590.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.78 : 1,002.72 = 427.93 : x
  2. Step 2: Convert to fraction form
    726.78/1,002.72 = 427.93/x
  3. Step 3: Cross multiply
    726.78x = 1,002.72 × 427.93
  4. Step 4: Simplify right side
    726.78x = 429,093.97
  5. Step 5: Solve for x
    x = 429,093.97/726.78
  6. Step 6: Final answer
    x = 590.40

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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.