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Finding the Fourth Proportional to 10,623.60, 15,913.80 and 8,679.60

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Solution

The fourth proportional to 10,623.60, 15,913.80 and 8,679.60 is: 13,001.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,623.60 : 15,913.80 = 8,679.60 : x
  2. Step 2: Convert to fraction form
    10,623.60/15,913.80 = 8,679.60/x
  3. Step 3: Cross multiply
    10,623.60x = 15,913.80 × 8,679.60
  4. Step 4: Simplify right side
    10,623.60x = 138,125,418.48
  5. Step 5: Solve for x
    x = 138,125,418.48/10,623.60
  6. Step 6: Final answer
    x = 13,001.75

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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.