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Finding the Fourth Proportional to 15,697.13, 21,661.95 and 8,623.40

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Solution

The fourth proportional to 15,697.13, 21,661.95 and 8,623.40 is: 11,900.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,697.13 : 21,661.95 = 8,623.40 : x
  2. Step 2: Convert to fraction form
    15,697.13/21,661.95 = 8,623.40/x
  3. Step 3: Cross multiply
    15,697.13x = 21,661.95 × 8,623.40
  4. Step 4: Simplify right side
    15,697.13x = 186,799,713.78
  5. Step 5: Solve for x
    x = 186,799,713.78/15,697.13
  6. Step 6: Final answer
    x = 11,900.24

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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.