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Finding the Fourth Proportional to 100,972.80, 151,459.20 and 51,206.40

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Solution

The fourth proportional to 100,972.80, 151,459.20 and 51,206.40 is: 76,809.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,972.80 : 151,459.20 = 51,206.40 : x
  2. Step 2: Convert to fraction form
    100,972.80/151,459.20 = 51,206.40/x
  3. Step 3: Cross multiply
    100,972.80x = 151,459.20 × 51,206.40
  4. Step 4: Simplify right side
    100,972.80x = 7,755,680,378.88
  5. Step 5: Solve for x
    x = 7,755,680,378.88/100,972.80
  6. Step 6: Final answer
    x = 76,809.60

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1.5x scale

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.