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Finding the Fourth Proportional to 218,885.60, 328,328.40 and 61,113.80

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Solution

The fourth proportional to 218,885.60, 328,328.40 and 61,113.80 is: 91,670.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,885.60 : 328,328.40 = 61,113.80 : x
  2. Step 2: Convert to fraction form
    218,885.60/328,328.40 = 61,113.80/x
  3. Step 3: Cross multiply
    218,885.60x = 328,328.40 × 61,113.80
  4. Step 4: Simplify right side
    218,885.60x = 20,065,396,171.92
  5. Step 5: Solve for x
    x = 20,065,396,171.92/218,885.60
  6. Step 6: Final answer
    x = 91,670.70

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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.