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Finding the Fourth Proportional to 138,460.79, 191,087.12 and 78,035.52

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Solution

The fourth proportional to 138,460.79, 191,087.12 and 78,035.52 is: 107,695.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,460.79 : 191,087.12 = 78,035.52 : x
  2. Step 2: Convert to fraction form
    138,460.79/191,087.12 = 78,035.52/x
  3. Step 3: Cross multiply
    138,460.79x = 191,087.12 × 78,035.52
  4. Step 4: Simplify right side
    138,460.79x = 14,911,582,384.32
  5. Step 5: Solve for x
    x = 14,911,582,384.32/138,460.79
  6. Step 6: Final answer
    x = 107,695.35

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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.