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Finding the Fourth Proportional to 125,419.80, 187,838.10 and 85,762.20

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Solution

The fourth proportional to 125,419.80, 187,838.10 and 85,762.20 is: 128,443.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,419.80 : 187,838.10 = 85,762.20 : x
  2. Step 2: Convert to fraction form
    125,419.80/187,838.10 = 85,762.20/x
  3. Step 3: Cross multiply
    125,419.80x = 187,838.10 × 85,762.20
  4. Step 4: Simplify right side
    125,419.80x = 16,109,408,699.82
  5. Step 5: Solve for x
    x = 16,109,408,699.82/125,419.80
  6. Step 6: Final answer
    x = 128,443.90

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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.