Home / 90,318.40-135,331.80-56,978.80

Finding the Fourth Proportional to 90,318.40, 135,331.80 and 56,978.80

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Solution

The fourth proportional to 90,318.40, 135,331.80 and 56,978.80 is: 85,376.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,318.40 : 135,331.80 = 56,978.80 : x
  2. Step 2: Convert to fraction form
    90,318.40/135,331.80 = 56,978.80/x
  3. Step 3: Cross multiply
    90,318.40x = 135,331.80 × 56,978.80
  4. Step 4: Simplify right side
    90,318.40x = 7,711,043,565.84
  5. Step 5: Solve for x
    x = 7,711,043,565.84/90,318.40
  6. Step 6: Final answer
    x = 85,376.22

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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.