Home / 12,428.48-17,149.31-7,122.31

Finding the Fourth Proportional to 12,428.48, 17,149.31 and 7,122.31

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Solution

The fourth proportional to 12,428.48, 17,149.31 and 7,122.31 is: 9,827.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,428.48 : 17,149.31 = 7,122.31 : x
  2. Step 2: Convert to fraction form
    12,428.48/17,149.31 = 7,122.31/x
  3. Step 3: Cross multiply
    12,428.48x = 17,149.31 × 7,122.31
  4. Step 4: Simplify right side
    12,428.48x = 122,142,702.11
  5. Step 5: Solve for x
    x = 122,142,702.11/12,428.48
  6. Step 6: Final answer
    x = 9,827.65

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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.