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Finding the Fourth Proportional to 391,406.80, 587,110.20 and 142,056.40

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Solution

The fourth proportional to 391,406.80, 587,110.20 and 142,056.40 is: 213,084.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,406.80 : 587,110.20 = 142,056.40 : x
  2. Step 2: Convert to fraction form
    391,406.80/587,110.20 = 142,056.40/x
  3. Step 3: Cross multiply
    391,406.80x = 587,110.20 × 142,056.40
  4. Step 4: Simplify right side
    391,406.80x = 83,402,761,415.28
  5. Step 5: Solve for x
    x = 83,402,761,415.28/391,406.80
  6. Step 6: Final answer
    x = 213,084.60

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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.