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Finding the Fourth Proportional to 78,377.60, 108,107.20 and 65,421.12

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Solution

The fourth proportional to 78,377.60, 108,107.20 and 65,421.12 is: 90,236.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,377.60 : 108,107.20 = 65,421.12 : x
  2. Step 2: Convert to fraction form
    78,377.60/108,107.20 = 65,421.12/x
  3. Step 3: Cross multiply
    78,377.60x = 108,107.20 × 65,421.12
  4. Step 4: Simplify right side
    78,377.60x = 7,072,494,104.06
  5. Step 5: Solve for x
    x = 7,072,494,104.06/78,377.60
  6. Step 6: Final answer
    x = 90,236.17

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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.