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Finding the Fourth Proportional to 9,321, 12,862.98 and 5,129.16

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Solution

The fourth proportional to 9,321, 12,862.98 and 5,129.16 is: 7,078.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,321 : 12,862.98 = 5,129.16 : x
  2. Step 2: Convert to fraction form
    9,321/12,862.98 = 5,129.16/x
  3. Step 3: Cross multiply
    9,321x = 12,862.98 × 5,129.16
  4. Step 4: Simplify right side
    9,321x = 65,976,282.50
  5. Step 5: Solve for x
    x = 65,976,282.50/9,321
  6. Step 6: Final answer
    x = 7,078.24

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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.