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Finding the Fourth Proportional to 15,691.32, 21,655.35 and 8,619.21

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Solution

The fourth proportional to 15,691.32, 21,655.35 and 8,619.21 is: 11,895.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,691.32 : 21,655.35 = 8,619.21 : x
  2. Step 2: Convert to fraction form
    15,691.32/21,655.35 = 8,619.21/x
  3. Step 3: Cross multiply
    15,691.32x = 21,655.35 × 8,619.21
  4. Step 4: Simplify right side
    15,691.32x = 186,652,009.27
  5. Step 5: Solve for x
    x = 186,652,009.27/15,691.32
  6. Step 6: Final answer
    x = 11,895.24

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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.