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Finding the Fourth Proportional to 128,086.20, 191,870.10 and 72,617.40

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Solution

The fourth proportional to 128,086.20, 191,870.10 and 72,617.40 is: 108,779.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,086.20 : 191,870.10 = 72,617.40 : x
  2. Step 2: Convert to fraction form
    128,086.20/191,870.10 = 72,617.40/x
  3. Step 3: Cross multiply
    128,086.20x = 191,870.10 × 72,617.40
  4. Step 4: Simplify right side
    128,086.20x = 13,933,107,799.74
  5. Step 5: Solve for x
    x = 13,933,107,799.74/128,086.20
  6. Step 6: Final answer
    x = 108,779.15

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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.