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Finding the Fourth Proportional to 143,920.40, 198,600.77 and 79,385.74

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Solution

The fourth proportional to 143,920.40, 198,600.77 and 79,385.74 is: 109,547.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,920.40 : 198,600.77 = 79,385.74 : x
  2. Step 2: Convert to fraction form
    143,920.40/198,600.77 = 79,385.74/x
  3. Step 3: Cross multiply
    143,920.40x = 198,600.77 × 79,385.74
  4. Step 4: Simplify right side
    143,920.40x = 15,766,068,792.98
  5. Step 5: Solve for x
    x = 15,766,068,792.98/143,920.40
  6. Step 6: Final answer
    x = 109,547.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.