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Finding the Fourth Proportional to 315,775.20, 473,432.40 and 128,690.40

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Solution

The fourth proportional to 315,775.20, 473,432.40 and 128,690.40 is: 192,941.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,775.20 : 473,432.40 = 128,690.40 : x
  2. Step 2: Convert to fraction form
    315,775.20/473,432.40 = 128,690.40/x
  3. Step 3: Cross multiply
    315,775.20x = 473,432.40 × 128,690.40
  4. Step 4: Simplify right side
    315,775.20x = 60,926,204,928.96
  5. Step 5: Solve for x
    x = 60,926,204,928.96/315,775.20
  6. Step 6: Final answer
    x = 192,941.70

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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.