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Finding the Fourth Proportional to 315,906.40, 473,686.80 and 128,706.40

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Solution

The fourth proportional to 315,906.40, 473,686.80 and 128,706.40 is: 192,989.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,906.40 : 473,686.80 = 128,706.40 : x
  2. Step 2: Convert to fraction form
    315,906.40/473,686.80 = 128,706.40/x
  3. Step 3: Cross multiply
    315,906.40x = 473,686.80 × 128,706.40
  4. Step 4: Simplify right side
    315,906.40x = 60,966,522,755.52
  5. Step 5: Solve for x
    x = 60,966,522,755.52/315,906.40
  6. Step 6: Final answer
    x = 192,989.20

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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.