Home / 142,122.76-196,128.14-78,459.19

Finding the Fourth Proportional to 142,122.76, 196,128.14 and 78,459.19

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Solution

The fourth proportional to 142,122.76, 196,128.14 and 78,459.19 is: 108,272.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,122.76 : 196,128.14 = 78,459.19 : x
  2. Step 2: Convert to fraction form
    142,122.76/196,128.14 = 78,459.19/x
  3. Step 3: Cross multiply
    142,122.76x = 196,128.14 × 78,459.19
  4. Step 4: Simplify right side
    142,122.76x = 15,388,055,000.61
  5. Step 5: Solve for x
    x = 15,388,055,000.61/142,122.76
  6. Step 6: Final answer
    x = 108,272.98

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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.