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Finding the Fourth Proportional to 120,187.80, 180,281.70 and 57,979.80

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Solution

The fourth proportional to 120,187.80, 180,281.70 and 57,979.80 is: 86,969.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,187.80 : 180,281.70 = 57,979.80 : x
  2. Step 2: Convert to fraction form
    120,187.80/180,281.70 = 57,979.80/x
  3. Step 3: Cross multiply
    120,187.80x = 180,281.70 × 57,979.80
  4. Step 4: Simplify right side
    120,187.80x = 10,452,696,909.66
  5. Step 5: Solve for x
    x = 10,452,696,909.66/120,187.80
  6. Step 6: Final answer
    x = 86,969.70

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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.