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Finding the Fourth Proportional to 8,547.80, 12,821.70 and 8,125.40

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Solution

The fourth proportional to 8,547.80, 12,821.70 and 8,125.40 is: 12,188.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,547.80 : 12,821.70 = 8,125.40 : x
  2. Step 2: Convert to fraction form
    8,547.80/12,821.70 = 8,125.40/x
  3. Step 3: Cross multiply
    8,547.80x = 12,821.70 × 8,125.40
  4. Step 4: Simplify right side
    8,547.80x = 104,181,441.18
  5. Step 5: Solve for x
    x = 104,181,441.18/8,547.80
  6. Step 6: Final answer
    x = 12,188.10

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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.