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Finding the Fourth Proportional to 218,981.04, 328,471.56 and 78,663.12

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Solution

The fourth proportional to 218,981.04, 328,471.56 and 78,663.12 is: 117,994.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,981.04 : 328,471.56 = 78,663.12 : x
  2. Step 2: Convert to fraction form
    218,981.04/328,471.56 = 78,663.12/x
  3. Step 3: Cross multiply
    218,981.04x = 328,471.56 × 78,663.12
  4. Step 4: Simplify right side
    218,981.04x = 25,838,597,740.87
  5. Step 5: Solve for x
    x = 25,838,597,740.87/218,981.04
  6. Step 6: Final answer
    x = 117,994.68

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1.5x scale

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.