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Finding the Fourth Proportional to 7,210.89, 9,951 and 3,898.89

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Solution

The fourth proportional to 7,210.89, 9,951 and 3,898.89 is: 5,380.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,210.89 : 9,951 = 3,898.89 : x
  2. Step 2: Convert to fraction form
    7,210.89/9,951 = 3,898.89/x
  3. Step 3: Cross multiply
    7,210.89x = 9,951 × 3,898.89
  4. Step 4: Simplify right side
    7,210.89x = 38,797,854.39
  5. Step 5: Solve for x
    x = 38,797,854.39/7,210.89
  6. Step 6: Final answer
    x = 5,380.45

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Double scale
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Similar ratio
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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.