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Finding the Fourth Proportional to 138,897.84, 191,675.40 and 78,474.72

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Solution

The fourth proportional to 138,897.84, 191,675.40 and 78,474.72 is: 108,293.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,897.84 : 191,675.40 = 78,474.72 : x
  2. Step 2: Convert to fraction form
    138,897.84/191,675.40 = 78,474.72/x
  3. Step 3: Cross multiply
    138,897.84x = 191,675.40 × 78,474.72
  4. Step 4: Simplify right side
    138,897.84x = 15,041,673,345.89
  5. Step 5: Solve for x
    x = 15,041,673,345.89/138,897.84
  6. Step 6: Final answer
    x = 108,293.07

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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.