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Finding the Fourth Proportional to 199,439.20, 299,158.80 and 128,580.40

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Solution

The fourth proportional to 199,439.20, 299,158.80 and 128,580.40 is: 192,870.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    199,439.20 : 299,158.80 = 128,580.40 : x
  2. Step 2: Convert to fraction form
    199,439.20/299,158.80 = 128,580.40/x
  3. Step 3: Cross multiply
    199,439.20x = 299,158.80 × 128,580.40
  4. Step 4: Simplify right side
    199,439.20x = 38,465,958,167.52
  5. Step 5: Solve for x
    x = 38,465,958,167.52/199,439.20
  6. Step 6: Final answer
    x = 192,870.60

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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.