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Finding the Fourth Proportional to 20,679.12, 28,547.10 and 12,728.16

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Solution

The fourth proportional to 20,679.12, 28,547.10 and 12,728.16 is: 17,570.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,679.12 : 28,547.10 = 12,728.16 : x
  2. Step 2: Convert to fraction form
    20,679.12/28,547.10 = 12,728.16/x
  3. Step 3: Cross multiply
    20,679.12x = 28,547.10 × 12,728.16
  4. Step 4: Simplify right side
    20,679.12x = 363,352,056.34
  5. Step 5: Solve for x
    x = 363,352,056.34/20,679.12
  6. Step 6: Final answer
    x = 17,570.96

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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.