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Finding the Fourth Proportional to 20,995.48, 28,975.80 and 15,681.08

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Solution

The fourth proportional to 20,995.48, 28,975.80 and 15,681.08 is: 21,641.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,995.48 : 28,975.80 = 15,681.08 : x
  2. Step 2: Convert to fraction form
    20,995.48/28,975.80 = 15,681.08/x
  3. Step 3: Cross multiply
    20,995.48x = 28,975.80 × 15,681.08
  4. Step 4: Simplify right side
    20,995.48x = 454,371,837.86
  5. Step 5: Solve for x
    x = 454,371,837.86/20,995.48
  6. Step 6: Final answer
    x = 21,641.41

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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.