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Finding the Fourth Proportional to 7,689.51, 10,612.87 and 7,338.90

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Solution

The fourth proportional to 7,689.51, 10,612.87 and 7,338.90 is: 10,128.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,689.51 : 10,612.87 = 7,338.90 : x
  2. Step 2: Convert to fraction form
    7,689.51/10,612.87 = 7,338.90/x
  3. Step 3: Cross multiply
    7,689.51x = 10,612.87 × 7,338.90
  4. Step 4: Simplify right side
    7,689.51x = 77,886,854.38
  5. Step 5: Solve for x
    x = 77,886,854.38/7,689.51
  6. Step 6: Final answer
    x = 10,128.98

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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.