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Finding the Fourth Proportional to 315,911.40, 473,694.30 and 128,711.40

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Solution

The fourth proportional to 315,911.40, 473,694.30 and 128,711.40 is: 192,996.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,911.40 : 473,694.30 = 128,711.40 : x
  2. Step 2: Convert to fraction form
    315,911.40/473,694.30 = 128,711.40/x
  3. Step 3: Cross multiply
    315,911.40x = 473,694.30 × 128,711.40
  4. Step 4: Simplify right side
    315,911.40x = 60,969,856,525.02
  5. Step 5: Solve for x
    x = 60,969,856,525.02/315,911.40
  6. Step 6: Final answer
    x = 192,996.70

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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.