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Finding the Fourth Proportional to 139,873.20, 209,897.28 and 56,767.20

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Solution

The fourth proportional to 139,873.20, 209,897.28 and 56,767.20 is: 85,186.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,873.20 : 209,897.28 = 56,767.20 : x
  2. Step 2: Convert to fraction form
    139,873.20/209,897.28 = 56,767.20/x
  3. Step 3: Cross multiply
    139,873.20x = 209,897.28 × 56,767.20
  4. Step 4: Simplify right side
    139,873.20x = 11,915,280,873.22
  5. Step 5: Solve for x
    x = 11,915,280,873.22/139,873.20
  6. Step 6: Final answer
    x = 85,186.30

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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.