Home / 20,689.28-28,550.82-11,490.51

Finding the Fourth Proportional to 20,689.28, 28,550.82 and 11,490.51

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Solution

The fourth proportional to 20,689.28, 28,550.82 and 11,490.51 is: 15,856.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,689.28 : 28,550.82 = 11,490.51 : x
  2. Step 2: Convert to fraction form
    20,689.28/28,550.82 = 11,490.51/x
  3. Step 3: Cross multiply
    20,689.28x = 28,550.82 × 11,490.51
  4. Step 4: Simplify right side
    20,689.28x = 328,063,482.72
  5. Step 5: Solve for x
    x = 328,063,482.72/20,689.28
  6. Step 6: Final answer
    x = 15,856.69

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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.