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Finding the Fourth Proportional to 218,972.70, 328,216.05 and 85,808.70

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Solution

The fourth proportional to 218,972.70, 328,216.05 and 85,808.70 is: 128,617.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,972.70 : 328,216.05 = 85,808.70 : x
  2. Step 2: Convert to fraction form
    218,972.70/328,216.05 = 85,808.70/x
  3. Step 3: Cross multiply
    218,972.70x = 328,216.05 × 85,808.70
  4. Step 4: Simplify right side
    218,972.70x = 28,163,792,569.64
  5. Step 5: Solve for x
    x = 28,163,792,569.64/218,972.70
  6. Step 6: Final answer
    x = 128,617.83

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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.