Home / 21,004.89-28,988.79-15,690.48

Finding the Fourth Proportional to 21,004.89, 28,988.79 and 15,690.48

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Solution

The fourth proportional to 21,004.89, 28,988.79 and 15,690.48 is: 21,654.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,004.89 : 28,988.79 = 15,690.48 : x
  2. Step 2: Convert to fraction form
    21,004.89/28,988.79 = 15,690.48/x
  3. Step 3: Cross multiply
    21,004.89x = 28,988.79 × 15,690.48
  4. Step 4: Simplify right side
    21,004.89x = 454,847,862.17
  5. Step 5: Solve for x
    x = 454,847,862.17/21,004.89
  6. Step 6: Final answer
    x = 21,654.38

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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.