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Finding the Fourth Proportional to 7,188.45, 9,920.14 and 4,203.71

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Solution

The fourth proportional to 7,188.45, 9,920.14 and 4,203.71 is: 5,801.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,188.45 : 9,920.14 = 4,203.71 : x
  2. Step 2: Convert to fraction form
    7,188.45/9,920.14 = 4,203.71/x
  3. Step 3: Cross multiply
    7,188.45x = 9,920.14 × 4,203.71
  4. Step 4: Simplify right side
    7,188.45x = 41,701,331.61
  5. Step 5: Solve for x
    x = 41,701,331.61/7,188.45
  6. Step 6: Final answer
    x = 5,801.16

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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.