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Finding the Fourth Proportional to 139,731.40, 209,597.10 and 133,607.80

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Solution

The fourth proportional to 139,731.40, 209,597.10 and 133,607.80 is: 200,411.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,731.40 : 209,597.10 = 133,607.80 : x
  2. Step 2: Convert to fraction form
    139,731.40/209,597.10 = 133,607.80/x
  3. Step 3: Cross multiply
    139,731.40x = 209,597.10 × 133,607.80
  4. Step 4: Simplify right side
    139,731.40x = 28,003,807,417.38
  5. Step 5: Solve for x
    x = 28,003,807,417.38/139,731.40
  6. Step 6: Final answer
    x = 200,411.70

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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.