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Finding the Fourth Proportional to 8,663.58, 11,957.31 and 5,128.56

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Solution

The fourth proportional to 8,663.58, 11,957.31 and 5,128.56 is: 7,078.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,663.58 : 11,957.31 = 5,128.56 : x
  2. Step 2: Convert to fraction form
    8,663.58/11,957.31 = 5,128.56/x
  3. Step 3: Cross multiply
    8,663.58x = 11,957.31 × 5,128.56
  4. Step 4: Simplify right side
    8,663.58x = 61,323,781.77
  5. Step 5: Solve for x
    x = 61,323,781.77/8,663.58
  6. Step 6: Final answer
    x = 7,078.34

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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.