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Finding the Fourth Proportional to 15,679.53, 21,637.17 and 8,605.53

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Solution

The fourth proportional to 15,679.53, 21,637.17 and 8,605.53 is: 11,875.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,679.53 : 21,637.17 = 8,605.53 : x
  2. Step 2: Convert to fraction form
    15,679.53/21,637.17 = 8,605.53/x
  3. Step 3: Cross multiply
    15,679.53x = 21,637.17 × 8,605.53
  4. Step 4: Simplify right side
    15,679.53x = 186,199,315.55
  5. Step 5: Solve for x
    x = 186,199,315.55/15,679.53
  6. Step 6: Final answer
    x = 11,875.31

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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.