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Finding the Fourth Proportional to 126,420.90, 189,754.20 and 98,643.30

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Solution

The fourth proportional to 126,420.90, 189,754.20 and 98,643.30 is: 148,060.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,420.90 : 189,754.20 = 98,643.30 : x
  2. Step 2: Convert to fraction form
    126,420.90/189,754.20 = 98,643.30/x
  3. Step 3: Cross multiply
    126,420.90x = 189,754.20 × 98,643.30
  4. Step 4: Simplify right side
    126,420.90x = 18,717,980,476.86
  5. Step 5: Solve for x
    x = 18,717,980,476.86/126,420.90
  6. Step 6: Final answer
    x = 148,060.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.