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Finding the Fourth Proportional to 125,857.80, 189,005.40 and 66,808.80

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Solution

The fourth proportional to 125,857.80, 189,005.40 and 66,808.80 is: 100,329.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,857.80 : 189,005.40 = 66,808.80 : x
  2. Step 2: Convert to fraction form
    125,857.80/189,005.40 = 66,808.80/x
  3. Step 3: Cross multiply
    125,857.80x = 189,005.40 × 66,808.80
  4. Step 4: Simplify right side
    125,857.80x = 12,627,223,967.52
  5. Step 5: Solve for x
    x = 12,627,223,967.52/125,857.80
  6. Step 6: Final answer
    x = 100,329.29

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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.