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Finding the Fourth Proportional to 126,972, 175,221.36 and 70,392

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Solution

The fourth proportional to 126,972, 175,221.36 and 70,392 is: 97,140.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,972 : 175,221.36 = 70,392 : x
  2. Step 2: Convert to fraction form
    126,972/175,221.36 = 70,392/x
  3. Step 3: Cross multiply
    126,972x = 175,221.36 × 70,392
  4. Step 4: Simplify right side
    126,972x = 12,334,181,973.12
  5. Step 5: Solve for x
    x = 12,334,181,973.12/126,972
  6. Step 6: Final answer
    x = 97,140.96

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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.