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Finding the Fourth Proportional to 39,758.79, 54,868.14 and 21,854.25

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Solution

The fourth proportional to 39,758.79, 54,868.14 and 21,854.25 is: 30,159.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,758.79 : 54,868.14 = 21,854.25 : x
  2. Step 2: Convert to fraction form
    39,758.79/54,868.14 = 21,854.25/x
  3. Step 3: Cross multiply
    39,758.79x = 54,868.14 × 21,854.25
  4. Step 4: Simplify right side
    39,758.79x = 1,199,102,048.60
  5. Step 5: Solve for x
    x = 1,199,102,048.60/39,758.79
  6. Step 6: Final answer
    x = 30,159.42

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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.