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Finding the Fourth Proportional to 143,930.40, 215,620.20 and 77,348.40

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Solution

The fourth proportional to 143,930.40, 215,620.20 and 77,348.40 is: 115,874.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,930.40 : 215,620.20 = 77,348.40 : x
  2. Step 2: Convert to fraction form
    143,930.40/215,620.20 = 77,348.40/x
  3. Step 3: Cross multiply
    143,930.40x = 215,620.20 × 77,348.40
  4. Step 4: Simplify right side
    143,930.40x = 16,677,877,477.68
  5. Step 5: Solve for x
    x = 16,677,877,477.68/143,930.40
  6. Step 6: Final answer
    x = 115,874.60

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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.