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Finding the Fourth Proportional to 138,666.96, 191,360.45 and 78,250.40

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Solution

The fourth proportional to 138,666.96, 191,360.45 and 78,250.40 is: 107,985.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,666.96 : 191,360.45 = 78,250.40 : x
  2. Step 2: Convert to fraction form
    138,666.96/191,360.45 = 78,250.40/x
  3. Step 3: Cross multiply
    138,666.96x = 191,360.45 × 78,250.40
  4. Step 4: Simplify right side
    138,666.96x = 14,974,032,569.43
  5. Step 5: Solve for x
    x = 14,974,032,569.43/138,666.96
  6. Step 6: Final answer
    x = 107,985.58

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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.