Home / 20,636.48-28,478.40-11,205.20

Finding the Fourth Proportional to 20,636.48, 28,478.40 and 11,205.20

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Solution

The fourth proportional to 20,636.48, 28,478.40 and 11,205.20 is: 15,463.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,636.48 : 28,478.40 = 11,205.20 : x
  2. Step 2: Convert to fraction form
    20,636.48/28,478.40 = 11,205.20/x
  3. Step 3: Cross multiply
    20,636.48x = 28,478.40 × 11,205.20
  4. Step 4: Simplify right side
    20,636.48x = 319,106,167.68
  5. Step 5: Solve for x
    x = 319,106,167.68/20,636.48
  6. Step 6: Final answer
    x = 15,463.21

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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.