Home / 639,220.80-958,831.20-402,830.40

Finding the Fourth Proportional to 639,220.80, 958,831.20 and 402,830.40

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Solution

The fourth proportional to 639,220.80, 958,831.20 and 402,830.40 is: 604,245.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,220.80 : 958,831.20 = 402,830.40 : x
  2. Step 2: Convert to fraction form
    639,220.80/958,831.20 = 402,830.40/x
  3. Step 3: Cross multiply
    639,220.80x = 958,831.20 × 402,830.40
  4. Step 4: Simplify right side
    639,220.80x = 386,246,355,828.48
  5. Step 5: Solve for x
    x = 386,246,355,828.48/639,220.80
  6. Step 6: Final answer
    x = 604,245.60

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Double scale
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Similar ratio
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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.