Home / 128,748.12-177,680.70-72,154.68

Finding the Fourth Proportional to 128,748.12, 177,680.70 and 72,154.68

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Solution

The fourth proportional to 128,748.12, 177,680.70 and 72,154.68 is: 99,578.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,748.12 : 177,680.70 = 72,154.68 : x
  2. Step 2: Convert to fraction form
    128,748.12/177,680.70 = 72,154.68/x
  3. Step 3: Cross multiply
    128,748.12x = 177,680.70 × 72,154.68
  4. Step 4: Simplify right side
    128,748.12x = 12,820,494,050.68
  5. Step 5: Solve for x
    x = 12,820,494,050.68/128,748.12
  6. Step 6: Final answer
    x = 99,578.11

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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.