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Finding the Fourth Proportional to 8,959.40, 12,345.54 and 6,309.80

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Solution

The fourth proportional to 8,959.40, 12,345.54 and 6,309.80 is: 8,694.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,959.40 : 12,345.54 = 6,309.80 : x
  2. Step 2: Convert to fraction form
    8,959.40/12,345.54 = 6,309.80/x
  3. Step 3: Cross multiply
    8,959.40x = 12,345.54 × 6,309.80
  4. Step 4: Simplify right side
    8,959.40x = 77,897,888.29
  5. Step 5: Solve for x
    x = 77,897,888.29/8,959.40
  6. Step 6: Final answer
    x = 8,694.54

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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.