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Finding the Fourth Proportional to 86,815.60, 130,223.40 and 21,151.60

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Solution

The fourth proportional to 86,815.60, 130,223.40 and 21,151.60 is: 31,727.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,815.60 : 130,223.40 = 21,151.60 : x
  2. Step 2: Convert to fraction form
    86,815.60/130,223.40 = 21,151.60/x
  3. Step 3: Cross multiply
    86,815.60x = 130,223.40 × 21,151.60
  4. Step 4: Simplify right side
    86,815.60x = 2,754,433,267.44
  5. Step 5: Solve for x
    x = 2,754,433,267.44/86,815.60
  6. Step 6: Final answer
    x = 31,727.40

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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.