Home / 20,686.79-28,547.82-11,255.35

Finding the Fourth Proportional to 20,686.79, 28,547.82 and 11,255.35

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Solution

The fourth proportional to 20,686.79, 28,547.82 and 11,255.35 is: 15,532.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,686.79 : 28,547.82 = 11,255.35 : x
  2. Step 2: Convert to fraction form
    20,686.79/28,547.82 = 11,255.35/x
  3. Step 3: Cross multiply
    20,686.79x = 28,547.82 × 11,255.35
  4. Step 4: Simplify right side
    20,686.79x = 321,315,634.47
  5. Step 5: Solve for x
    x = 321,315,634.47/20,686.79
  6. Step 6: Final answer
    x = 15,532.41

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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.