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Finding the Fourth Proportional to 138,428.70, 193,931.40 and 138,428.70

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Solution

The fourth proportional to 138,428.70, 193,931.40 and 138,428.70 is: 193,931.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,428.70 : 193,931.40 = 138,428.70 : x
  2. Step 2: Convert to fraction form
    138,428.70/193,931.40 = 138,428.70/x
  3. Step 3: Cross multiply
    138,428.70x = 193,931.40 × 138,428.70
  4. Step 4: Simplify right side
    138,428.70x = 26,845,671,591.18
  5. Step 5: Solve for x
    x = 26,845,671,591.18/138,428.70
  6. Step 6: Final answer
    x = 193,931.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.