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Finding the Fourth Proportional to 39,291.70, 54,223.70 and 21,387.87

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Solution

The fourth proportional to 39,291.70, 54,223.70 and 21,387.87 is: 29,515.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,291.70 : 54,223.70 = 21,387.87 : x
  2. Step 2: Convert to fraction form
    39,291.70/54,223.70 = 21,387.87/x
  3. Step 3: Cross multiply
    39,291.70x = 54,223.70 × 21,387.87
  4. Step 4: Simplify right side
    39,291.70x = 1,159,729,446.52
  5. Step 5: Solve for x
    x = 1,159,729,446.52/39,291.70
  6. Step 6: Final answer
    x = 29,515.89

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1.5x scale

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.