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Finding the Fourth Proportional to 12,488.78, 17,232.95 and 7,111.92

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Solution

The fourth proportional to 12,488.78, 17,232.95 and 7,111.92 is: 9,813.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,488.78 : 17,232.95 = 7,111.92 : x
  2. Step 2: Convert to fraction form
    12,488.78/17,232.95 = 7,111.92/x
  3. Step 3: Cross multiply
    12,488.78x = 17,232.95 × 7,111.92
  4. Step 4: Simplify right side
    12,488.78x = 122,559,326.20
  5. Step 5: Solve for x
    x = 122,559,326.20/12,488.78
  6. Step 6: Final answer
    x = 9,813.56

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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.