Home / 20,681.02-28,540.11-12,718.54

Finding the Fourth Proportional to 20,681.02, 28,540.11 and 12,718.54

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Solution

The fourth proportional to 20,681.02, 28,540.11 and 12,718.54 is: 17,551.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,681.02 : 28,540.11 = 12,718.54 : x
  2. Step 2: Convert to fraction form
    20,681.02/28,540.11 = 12,718.54/x
  3. Step 3: Cross multiply
    20,681.02x = 28,540.11 × 12,718.54
  4. Step 4: Simplify right side
    20,681.02x = 362,988,530.64
  5. Step 5: Solve for x
    x = 362,988,530.64/20,681.02
  6. Step 6: Final answer
    x = 17,551.77

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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.