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Finding the Fourth Proportional to 7,128.92, 10,649.92 and 6,869.72

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Solution

The fourth proportional to 7,128.92, 10,649.92 and 6,869.72 is: 10,262.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,128.92 : 10,649.92 = 6,869.72 : x
  2. Step 2: Convert to fraction form
    7,128.92/10,649.92 = 6,869.72/x
  3. Step 3: Cross multiply
    7,128.92x = 10,649.92 × 6,869.72
  4. Step 4: Simplify right side
    7,128.92x = 73,161,968.42
  5. Step 5: Solve for x
    x = 73,161,968.42/7,128.92
  6. Step 6: Final answer
    x = 10,262.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.