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Finding the Fourth Proportional to 138,910.04, 191,699.66 and 78,479.48

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Solution

The fourth proportional to 138,910.04, 191,699.66 and 78,479.48 is: 108,303.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,910.04 : 191,699.66 = 78,479.48 : x
  2. Step 2: Convert to fraction form
    138,910.04/191,699.66 = 78,479.48/x
  3. Step 3: Cross multiply
    138,910.04x = 191,699.66 × 78,479.48
  4. Step 4: Simplify right side
    138,910.04x = 15,044,490,308.42
  5. Step 5: Solve for x
    x = 15,044,490,308.42/138,910.04
  6. Step 6: Final answer
    x = 108,303.84

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1.5x scale

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.