Home / 15,435.90-21,301.92-8,721.68

Finding the Fourth Proportional to 15,435.90, 21,301.92 and 8,721.68

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Solution

The fourth proportional to 15,435.90, 21,301.92 and 8,721.68 is: 12,036.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,435.90 : 21,301.92 = 8,721.68 : x
  2. Step 2: Convert to fraction form
    15,435.90/21,301.92 = 8,721.68/x
  3. Step 3: Cross multiply
    15,435.90x = 21,301.92 × 8,721.68
  4. Step 4: Simplify right side
    15,435.90x = 185,788,423.12
  5. Step 5: Solve for x
    x = 185,788,423.12/15,435.90
  6. Step 6: Final answer
    x = 12,036.13

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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.