Home / 12,478.38-17,220.36-6,889.38

Finding the Fourth Proportional to 12,478.38, 17,220.36 and 6,889.38

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Solution

The fourth proportional to 12,478.38, 17,220.36 and 6,889.38 is: 9,507.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,478.38 : 17,220.36 = 6,889.38 : x
  2. Step 2: Convert to fraction form
    12,478.38/17,220.36 = 6,889.38/x
  3. Step 3: Cross multiply
    12,478.38x = 17,220.36 × 6,889.38
  4. Step 4: Simplify right side
    12,478.38x = 118,637,603.78
  5. Step 5: Solve for x
    x = 118,637,603.78/12,478.38
  6. Step 6: Final answer
    x = 9,507.45

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Half scale
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Double scale
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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.