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Finding the Fourth Proportional to 103,711.72, 143,079.60 and 76,920.16

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Solution

The fourth proportional to 103,711.72, 143,079.60 and 76,920.16 is: 106,118.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,711.72 : 143,079.60 = 76,920.16 : x
  2. Step 2: Convert to fraction form
    103,711.72/143,079.60 = 76,920.16/x
  3. Step 3: Cross multiply
    103,711.72x = 143,079.60 × 76,920.16
  4. Step 4: Simplify right side
    103,711.72x = 11,005,705,724.74
  5. Step 5: Solve for x
    x = 11,005,705,724.74/103,711.72
  6. Step 6: Final answer
    x = 106,118.25

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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.