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Finding the Fourth Proportional to 12,488.48, 17,218.32 and 9,128.48

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Solution

The fourth proportional to 12,488.48, 17,218.32 and 9,128.48 is: 12,585.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,488.48 : 17,218.32 = 9,128.48 : x
  2. Step 2: Convert to fraction form
    12,488.48/17,218.32 = 9,128.48/x
  3. Step 3: Cross multiply
    12,488.48x = 17,218.32 × 9,128.48
  4. Step 4: Simplify right side
    12,488.48x = 157,177,089.75
  5. Step 5: Solve for x
    x = 157,177,089.75/12,488.48
  6. Step 6: Final answer
    x = 12,585.77

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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.