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Finding the Fourth Proportional to 639,221.80, 958,832.70 and 402,831.40

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Solution

The fourth proportional to 639,221.80, 958,832.70 and 402,831.40 is: 604,247.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,221.80 : 958,832.70 = 402,831.40 : x
  2. Step 2: Convert to fraction form
    639,221.80/958,832.70 = 402,831.40/x
  3. Step 3: Cross multiply
    639,221.80x = 958,832.70 × 402,831.40
  4. Step 4: Simplify right side
    639,221.80x = 386,247,918,906.78
  5. Step 5: Solve for x
    x = 386,247,918,906.78/639,221.80
  6. Step 6: Final answer
    x = 604,247.10

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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.