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Finding the Fourth Proportional to 155,978.65, 215,250.54 and 84,358.67

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Solution

The fourth proportional to 155,978.65, 215,250.54 and 84,358.67 is: 116,414.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,978.65 : 215,250.54 = 84,358.67 : x
  2. Step 2: Convert to fraction form
    155,978.65/215,250.54 = 84,358.67/x
  3. Step 3: Cross multiply
    155,978.65x = 215,250.54 × 84,358.67
  4. Step 4: Simplify right side
    155,978.65x = 18,158,248,849.39
  5. Step 5: Solve for x
    x = 18,158,248,849.39/155,978.65
  6. Step 6: Final answer
    x = 116,414.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.