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Finding the Fourth Proportional to 125,903.40, 189,000.90 and 76,039.80

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Solution

The fourth proportional to 125,903.40, 189,000.90 and 76,039.80 is: 114,147.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,903.40 : 189,000.90 = 76,039.80 : x
  2. Step 2: Convert to fraction form
    125,903.40/189,000.90 = 76,039.80/x
  3. Step 3: Cross multiply
    125,903.40x = 189,000.90 × 76,039.80
  4. Step 4: Simplify right side
    125,903.40x = 14,371,590,635.82
  5. Step 5: Solve for x
    x = 14,371,590,635.82/125,903.40
  6. Step 6: Final answer
    x = 114,147.76

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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.