Home / 20,547.23-28,355.21-11,115.78

Finding the Fourth Proportional to 20,547.23, 28,355.21 and 11,115.78

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Solution

The fourth proportional to 20,547.23, 28,355.21 and 11,115.78 is: 15,339.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,547.23 : 28,355.21 = 11,115.78 : x
  2. Step 2: Convert to fraction form
    20,547.23/28,355.21 = 11,115.78/x
  3. Step 3: Cross multiply
    20,547.23x = 28,355.21 × 11,115.78
  4. Step 4: Simplify right side
    20,547.23x = 315,190,220.63
  5. Step 5: Solve for x
    x = 315,190,220.63/20,547.23
  6. Step 6: Final answer
    x = 15,339.80

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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.