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Finding the Fourth Proportional to 78,400.60, 108,085.70 and 53,870.66

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Solution

The fourth proportional to 78,400.60, 108,085.70 and 53,870.66 is: 74,267.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,400.60 : 108,085.70 = 53,870.66 : x
  2. Step 2: Convert to fraction form
    78,400.60/108,085.70 = 53,870.66/x
  3. Step 3: Cross multiply
    78,400.60x = 108,085.70 × 53,870.66
  4. Step 4: Simplify right side
    78,400.60x = 5,822,647,995.56
  5. Step 5: Solve for x
    x = 5,822,647,995.56/78,400.60
  6. Step 6: Final answer
    x = 74,267.90

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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.