Home / 142,381.20-196,487.28-78,721.68

Finding the Fourth Proportional to 142,381.20, 196,487.28 and 78,721.68

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Solution

The fourth proportional to 142,381.20, 196,487.28 and 78,721.68 is: 108,636.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,381.20 : 196,487.28 = 78,721.68 : x
  2. Step 2: Convert to fraction form
    142,381.20/196,487.28 = 78,721.68/x
  3. Step 3: Cross multiply
    142,381.20x = 196,487.28 × 78,721.68
  4. Step 4: Simplify right side
    142,381.20x = 15,467,808,780.23
  5. Step 5: Solve for x
    x = 15,467,808,780.23/142,381.20
  6. Step 6: Final answer
    x = 108,636.60

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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.