Home / 21,728.79-29,988.77-15,698.55

Finding the Fourth Proportional to 21,728.79, 29,988.77 and 15,698.55

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Solution

The fourth proportional to 21,728.79, 29,988.77 and 15,698.55 is: 21,666.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,728.79 : 29,988.77 = 15,698.55 : x
  2. Step 2: Convert to fraction form
    21,728.79/29,988.77 = 15,698.55/x
  3. Step 3: Cross multiply
    21,728.79x = 29,988.77 × 15,698.55
  4. Step 4: Simplify right side
    21,728.79x = 470,780,205.28
  5. Step 5: Solve for x
    x = 470,780,205.28/21,728.79
  6. Step 6: Final answer
    x = 21,666.20

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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.