Home / 138,899.61-191,670.10-78,475.50

Finding the Fourth Proportional to 138,899.61, 191,670.10 and 78,475.50

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Solution

The fourth proportional to 138,899.61, 191,670.10 and 78,475.50 is: 108,289.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,899.61 : 191,670.10 = 78,475.50 : x
  2. Step 2: Convert to fraction form
    138,899.61/191,670.10 = 78,475.50/x
  3. Step 3: Cross multiply
    138,899.61x = 191,670.10 × 78,475.50
  4. Step 4: Simplify right side
    138,899.61x = 15,041,406,736.36
  5. Step 5: Solve for x
    x = 15,041,406,736.36/138,899.61
  6. Step 6: Final answer
    x = 108,289.77

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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.