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Finding the Fourth Proportional to 71,585.47, 107,378.07 and 18,990.82

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Solution

The fourth proportional to 71,585.47, 107,378.07 and 18,990.82 is: 28,486.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,585.47 : 107,378.07 = 18,990.82 : x
  2. Step 2: Convert to fraction form
    71,585.47/107,378.07 = 18,990.82/x
  3. Step 3: Cross multiply
    71,585.47x = 107,378.07 × 18,990.82
  4. Step 4: Simplify right side
    71,585.47x = 2,039,197,599.32
  5. Step 5: Solve for x
    x = 2,039,197,599.32/71,585.47
  6. Step 6: Final answer
    x = 28,486.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.