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Finding the Fourth Proportional to 139,988.40, 210,009.60 and 60,025.20

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Solution

The fourth proportional to 139,988.40, 210,009.60 and 60,025.20 is: 90,049.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,988.40 : 210,009.60 = 60,025.20 : x
  2. Step 2: Convert to fraction form
    139,988.40/210,009.60 = 60,025.20/x
  3. Step 3: Cross multiply
    139,988.40x = 210,009.60 × 60,025.20
  4. Step 4: Simplify right side
    139,988.40x = 12,605,868,241.92
  5. Step 5: Solve for x
    x = 12,605,868,241.92/139,988.40
  6. Step 6: Final answer
    x = 90,049.38

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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.