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Finding the Fourth Proportional to 9,321.78, 12,866.80 and 5,547.62

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Solution

The fourth proportional to 9,321.78, 12,866.80 and 5,547.62 is: 7,657.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,321.78 : 12,866.80 = 5,547.62 : x
  2. Step 2: Convert to fraction form
    9,321.78/12,866.80 = 5,547.62/x
  3. Step 3: Cross multiply
    9,321.78x = 12,866.80 × 5,547.62
  4. Step 4: Simplify right side
    9,321.78x = 71,380,117.02
  5. Step 5: Solve for x
    x = 71,380,117.02/9,321.78
  6. Step 6: Final answer
    x = 7,657.35

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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.