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Finding the Fourth Proportional to 15,851.75, 21,875.42 and 8,681.68

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Solution

The fourth proportional to 15,851.75, 21,875.42 and 8,681.68 is: 11,980.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,851.75 : 21,875.42 = 8,681.68 : x
  2. Step 2: Convert to fraction form
    15,851.75/21,875.42 = 8,681.68/x
  3. Step 3: Cross multiply
    15,851.75x = 21,875.42 × 8,681.68
  4. Step 4: Simplify right side
    15,851.75x = 189,915,396.52
  5. Step 5: Solve for x
    x = 189,915,396.52/15,851.75
  6. Step 6: Final answer
    x = 11,980.72

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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.