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Finding the Fourth Proportional to 15,918, 21,968.87 and 9,630.42

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Solution

The fourth proportional to 15,918, 21,968.87 and 9,630.42 is: 13,291.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,918 : 21,968.87 = 9,630.42 : x
  2. Step 2: Convert to fraction form
    15,918/21,968.87 = 9,630.42/x
  3. Step 3: Cross multiply
    15,918x = 21,968.87 × 9,630.42
  4. Step 4: Simplify right side
    15,918x = 211,569,396.87
  5. Step 5: Solve for x
    x = 211,569,396.87/15,918
  6. Step 6: Final answer
    x = 13,291.20

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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.