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Finding the Fourth Proportional to 8,939.70, 12,345.82 and 7,432.70

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Solution

The fourth proportional to 8,939.70, 12,345.82 and 7,432.70 is: 10,264.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,939.70 : 12,345.82 = 7,432.70 : x
  2. Step 2: Convert to fraction form
    8,939.70/12,345.82 = 7,432.70/x
  3. Step 3: Cross multiply
    8,939.70x = 12,345.82 × 7,432.70
  4. Step 4: Simplify right side
    8,939.70x = 91,762,696.00
  5. Step 5: Solve for x
    x = 91,762,696.00/8,939.70
  6. Step 6: Final answer
    x = 10,264.63

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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.