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Finding the Fourth Proportional to 39,686.40, 59,446.80 and 18,644.40

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Solution

The fourth proportional to 39,686.40, 59,446.80 and 18,644.40 is: 27,927.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,686.40 : 59,446.80 = 18,644.40 : x
  2. Step 2: Convert to fraction form
    39,686.40/59,446.80 = 18,644.40/x
  3. Step 3: Cross multiply
    39,686.40x = 59,446.80 × 18,644.40
  4. Step 4: Simplify right side
    39,686.40x = 1,108,349,917.92
  5. Step 5: Solve for x
    x = 1,108,349,917.92/39,686.40
  6. Step 6: Final answer
    x = 27,927.70

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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.