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Finding the Fourth Proportional to 218,949.76, 328,292.64 and 85,670.88

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Solution

The fourth proportional to 218,949.76, 328,292.64 and 85,670.88 is: 128,454.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,949.76 : 328,292.64 = 85,670.88 : x
  2. Step 2: Convert to fraction form
    218,949.76/328,292.64 = 85,670.88/x
  3. Step 3: Cross multiply
    218,949.76x = 328,292.64 × 85,670.88
  4. Step 4: Simplify right side
    218,949.76x = 28,125,119,366.32
  5. Step 5: Solve for x
    x = 28,125,119,366.32/218,949.76
  6. Step 6: Final answer
    x = 128,454.67

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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.