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Finding the Fourth Proportional to 78,666.30, 108,598.86 and 61,641.72

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Solution

The fourth proportional to 78,666.30, 108,598.86 and 61,641.72 is: 85,096.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,666.30 : 108,598.86 = 61,641.72 : x
  2. Step 2: Convert to fraction form
    78,666.30/108,598.86 = 61,641.72/x
  3. Step 3: Cross multiply
    78,666.30x = 108,598.86 × 61,641.72
  4. Step 4: Simplify right side
    78,666.30x = 6,694,220,520.44
  5. Step 5: Solve for x
    x = 6,694,220,520.44/78,666.30
  6. Step 6: Final answer
    x = 85,096.42

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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.