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Finding the Fourth Proportional to 10,465.76, 15,697.29 and 8,721.65

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Solution

The fourth proportional to 10,465.76, 15,697.29 and 8,721.65 is: 13,081.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,465.76 : 15,697.29 = 8,721.65 : x
  2. Step 2: Convert to fraction form
    10,465.76/15,697.29 = 8,721.65/x
  3. Step 3: Cross multiply
    10,465.76x = 15,697.29 × 8,721.65
  4. Step 4: Simplify right side
    10,465.76x = 136,906,269.33
  5. Step 5: Solve for x
    x = 136,906,269.33/10,465.76
  6. Step 6: Final answer
    x = 13,081.35

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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.