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Finding the Fourth Proportional to 103,675, 143,088.78 and 78,480.76

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Solution

The fourth proportional to 103,675, 143,088.78 and 78,480.76 is: 108,316.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,675 : 143,088.78 = 78,480.76 : x
  2. Step 2: Convert to fraction form
    103,675/143,088.78 = 78,480.76/x
  3. Step 3: Cross multiply
    103,675x = 143,088.78 × 78,480.76
  4. Step 4: Simplify right side
    103,675x = 11,229,716,201.87
  5. Step 5: Solve for x
    x = 11,229,716,201.87/103,675
  6. Step 6: Final answer
    x = 108,316.53

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1.5x scale

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.