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Finding the Fourth Proportional to 39,689.70, 59,514.27 and 20,979.78

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Solution

The fourth proportional to 39,689.70, 59,514.27 and 20,979.78 is: 31,458.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,689.70 : 59,514.27 = 20,979.78 : x
  2. Step 2: Convert to fraction form
    39,689.70/59,514.27 = 20,979.78/x
  3. Step 3: Cross multiply
    39,689.70x = 59,514.27 × 20,979.78
  4. Step 4: Simplify right side
    39,689.70x = 1,248,596,291.46
  5. Step 5: Solve for x
    x = 1,248,596,291.46/39,689.70
  6. Step 6: Final answer
    x = 31,458.95

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1.5x scale

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.