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Finding the Fourth Proportional to 21,398.87, 32,080.91 and 8,928.18

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Solution

The fourth proportional to 21,398.87, 32,080.91 and 8,928.18 is: 13,385.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,398.87 : 32,080.91 = 8,928.18 : x
  2. Step 2: Convert to fraction form
    21,398.87/32,080.91 = 8,928.18/x
  3. Step 3: Cross multiply
    21,398.87x = 32,080.91 × 8,928.18
  4. Step 4: Simplify right side
    21,398.87x = 286,424,116.72
  5. Step 5: Solve for x
    x = 286,424,116.72/21,398.87
  6. Step 6: Final answer
    x = 13,385.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.