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Finding the Fourth Proportional to 218,931.70, 328,411.40 and 92,555.30

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Solution

The fourth proportional to 218,931.70, 328,411.40 and 92,555.30 is: 138,838.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,931.70 : 328,411.40 = 92,555.30 : x
  2. Step 2: Convert to fraction form
    218,931.70/328,411.40 = 92,555.30/x
  3. Step 3: Cross multiply
    218,931.70x = 328,411.40 × 92,555.30
  4. Step 4: Simplify right side
    218,931.70x = 30,396,216,529.30
  5. Step 5: Solve for x
    x = 30,396,216,529.30/218,931.70
  6. Step 6: Final answer
    x = 138,838.81

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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.