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Finding the Fourth Proportional to 15,637.80, 21,579 and 8,831.41

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Solution

The fourth proportional to 15,637.80, 21,579 and 8,831.41 is: 12,186.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,637.80 : 21,579 = 8,831.41 : x
  2. Step 2: Convert to fraction form
    15,637.80/21,579 = 8,831.41/x
  3. Step 3: Cross multiply
    15,637.80x = 21,579 × 8,831.41
  4. Step 4: Simplify right side
    15,637.80x = 190,572,996.39
  5. Step 5: Solve for x
    x = 190,572,996.39/15,637.80
  6. Step 6: Final answer
    x = 12,186.69

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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.