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Finding the Fourth Proportional to 15,021, 20,721.78 and 9,717.48

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Solution

The fourth proportional to 15,021, 20,721.78 and 9,717.48 is: 13,405.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,021 : 20,721.78 = 9,717.48 : x
  2. Step 2: Convert to fraction form
    15,021/20,721.78 = 9,717.48/x
  3. Step 3: Cross multiply
    15,021x = 20,721.78 × 9,717.48
  4. Step 4: Simplify right side
    15,021x = 201,363,482.71
  5. Step 5: Solve for x
    x = 201,363,482.71/15,021
  6. Step 6: Final answer
    x = 13,405.46

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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.