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Finding the Fourth Proportional to 3,918.65, 5,407.17 and 2,239.79

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Solution

The fourth proportional to 3,918.65, 5,407.17 and 2,239.79 is: 3,090.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,918.65 : 5,407.17 = 2,239.79 : x
  2. Step 2: Convert to fraction form
    3,918.65/5,407.17 = 2,239.79/x
  3. Step 3: Cross multiply
    3,918.65x = 5,407.17 × 2,239.79
  4. Step 4: Simplify right side
    3,918.65x = 12,110,925.29
  5. Step 5: Solve for x
    x = 12,110,925.29/3,918.65
  6. Step 6: Final answer
    x = 3,090.59

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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.