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Finding the Fourth Proportional to 15,139.29, 20,880.39 and 9,835.82

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Solution

The fourth proportional to 15,139.29, 20,880.39 and 9,835.82 is: 13,565.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,139.29 : 20,880.39 = 9,835.82 : x
  2. Step 2: Convert to fraction form
    15,139.29/20,880.39 = 9,835.82/x
  3. Step 3: Cross multiply
    15,139.29x = 20,880.39 × 9,835.82
  4. Step 4: Simplify right side
    15,139.29x = 205,375,603.99
  5. Step 5: Solve for x
    x = 205,375,603.99/15,139.29
  6. Step 6: Final answer
    x = 13,565.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.