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Finding the Fourth Proportional to 125,862.80, 189,012.90 and 66,813.80

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Solution

The fourth proportional to 125,862.80, 189,012.90 and 66,813.80 is: 100,336.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,862.80 : 189,012.90 = 66,813.80 : x
  2. Step 2: Convert to fraction form
    125,862.80/189,012.90 = 66,813.80/x
  3. Step 3: Cross multiply
    125,862.80x = 189,012.90 × 66,813.80
  4. Step 4: Simplify right side
    125,862.80x = 12,628,670,098.02
  5. Step 5: Solve for x
    x = 12,628,670,098.02/125,862.80
  6. Step 6: Final answer
    x = 100,336.80

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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.