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Finding the Fourth Proportional to 78,245.70, 108,020.93 and 61,213.76

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Solution

The fourth proportional to 78,245.70, 108,020.93 and 61,213.76 is: 84,507.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,245.70 : 108,020.93 = 61,213.76 : x
  2. Step 2: Convert to fraction form
    78,245.70/108,020.93 = 61,213.76/x
  3. Step 3: Cross multiply
    78,245.70x = 108,020.93 × 61,213.76
  4. Step 4: Simplify right side
    78,245.70x = 6,612,366,842.90
  5. Step 5: Solve for x
    x = 6,612,366,842.90/78,245.70
  6. Step 6: Final answer
    x = 84,507.74

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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.