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Finding the Fourth Proportional to 138,419.55, 191,015.82 and 84,704.40

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Solution

The fourth proportional to 138,419.55, 191,015.82 and 84,704.40 is: 116,890.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,419.55 : 191,015.82 = 84,704.40 : x
  2. Step 2: Convert to fraction form
    138,419.55/191,015.82 = 84,704.40/x
  3. Step 3: Cross multiply
    138,419.55x = 191,015.82 × 84,704.40
  4. Step 4: Simplify right side
    138,419.55x = 16,179,880,423.61
  5. Step 5: Solve for x
    x = 16,179,880,423.61/138,419.55
  6. Step 6: Final answer
    x = 116,890.14

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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.