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Finding the Fourth Proportional to 5,725.69, 7,890.71 and 4,129.58

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Solution

The fourth proportional to 5,725.69, 7,890.71 and 4,129.58 is: 5,691.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,725.69 : 7,890.71 = 4,129.58 : x
  2. Step 2: Convert to fraction form
    5,725.69/7,890.71 = 4,129.58/x
  3. Step 3: Cross multiply
    5,725.69x = 7,890.71 × 4,129.58
  4. Step 4: Simplify right side
    5,725.69x = 32,585,317.28
  5. Step 5: Solve for x
    x = 32,585,317.28/5,725.69
  6. Step 6: Final answer
    x = 5,691.08

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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.