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Finding the Fourth Proportional to 86,812.60, 130,218.90 and 21,148.60

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Solution

The fourth proportional to 86,812.60, 130,218.90 and 21,148.60 is: 31,722.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,812.60 : 130,218.90 = 21,148.60 : x
  2. Step 2: Convert to fraction form
    86,812.60/130,218.90 = 21,148.60/x
  3. Step 3: Cross multiply
    86,812.60x = 130,218.90 × 21,148.60
  4. Step 4: Simplify right side
    86,812.60x = 2,753,947,428.54
  5. Step 5: Solve for x
    x = 2,753,947,428.54/86,812.60
  6. Step 6: Final answer
    x = 31,722.90

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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.