Home / 12,678.20-17,490.09-8,203.40

Finding the Fourth Proportional to 12,678.20, 17,490.09 and 8,203.40

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Solution

The fourth proportional to 12,678.20, 17,490.09 and 8,203.40 is: 11,316.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,678.20 : 17,490.09 = 8,203.40 : x
  2. Step 2: Convert to fraction form
    12,678.20/17,490.09 = 8,203.40/x
  3. Step 3: Cross multiply
    12,678.20x = 17,490.09 × 8,203.40
  4. Step 4: Simplify right side
    12,678.20x = 143,478,116.86
  5. Step 5: Solve for x
    x = 143,478,116.86/12,678.20
  6. Step 6: Final answer
    x = 11,316.92

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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.