Home / 15,420.22-21,275.56-9,678.44

Finding the Fourth Proportional to 15,420.22, 21,275.56 and 9,678.44

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Solution

The fourth proportional to 15,420.22, 21,275.56 and 9,678.44 is: 13,353.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,420.22 : 21,275.56 = 9,678.44 : x
  2. Step 2: Convert to fraction form
    15,420.22/21,275.56 = 9,678.44/x
  3. Step 3: Cross multiply
    15,420.22x = 21,275.56 × 9,678.44
  4. Step 4: Simplify right side
    15,420.22x = 205,914,176.54
  5. Step 5: Solve for x
    x = 205,914,176.54/15,420.22
  6. Step 6: Final answer
    x = 13,353.51

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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.