Home / 12,918.40-17,827.20-7,329.28

Finding the Fourth Proportional to 12,918.40, 17,827.20 and 7,329.28

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Solution

The fourth proportional to 12,918.40, 17,827.20 and 7,329.28 is: 10,114.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,918.40 : 17,827.20 = 7,329.28 : x
  2. Step 2: Convert to fraction form
    12,918.40/17,827.20 = 7,329.28/x
  3. Step 3: Cross multiply
    12,918.40x = 17,827.20 × 7,329.28
  4. Step 4: Simplify right side
    12,918.40x = 130,660,540.42
  5. Step 5: Solve for x
    x = 130,660,540.42/12,918.40
  6. Step 6: Final answer
    x = 10,114.30

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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.