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Finding the Fourth Proportional to 138,381.51, 190,877.91 and 87,304.13

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Solution

The fourth proportional to 138,381.51, 190,877.91 and 87,304.13 is: 120,423.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,381.51 : 190,877.91 = 87,304.13 : x
  2. Step 2: Convert to fraction form
    138,381.51/190,877.91 = 87,304.13/x
  3. Step 3: Cross multiply
    138,381.51x = 190,877.91 × 87,304.13
  4. Step 4: Simplify right side
    138,381.51x = 16,664,429,868.77
  5. Step 5: Solve for x
    x = 16,664,429,868.77/138,381.51
  6. Step 6: Final answer
    x = 120,423.82

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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.