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Finding the Fourth Proportional to 10,647.11, 15,895.80 and 8,135.15

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Solution

The fourth proportional to 10,647.11, 15,895.80 and 8,135.15 is: 12,145.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,647.11 : 15,895.80 = 8,135.15 : x
  2. Step 2: Convert to fraction form
    10,647.11/15,895.80 = 8,135.15/x
  3. Step 3: Cross multiply
    10,647.11x = 15,895.80 × 8,135.15
  4. Step 4: Simplify right side
    10,647.11x = 129,314,657.29
  5. Step 5: Solve for x
    x = 129,314,657.29/10,647.11
  6. Step 6: Final answer
    x = 12,145.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.