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Finding the Fourth Proportional to 7,236.80, 9,985.92 and 4,252.40

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Solution

The fourth proportional to 7,236.80, 9,985.92 and 4,252.40 is: 5,867.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,236.80 : 9,985.92 = 4,252.40 : x
  2. Step 2: Convert to fraction form
    7,236.80/9,985.92 = 4,252.40/x
  3. Step 3: Cross multiply
    7,236.80x = 9,985.92 × 4,252.40
  4. Step 4: Simplify right side
    7,236.80x = 42,464,126.21
  5. Step 5: Solve for x
    x = 42,464,126.21/7,236.80
  6. Step 6: Final answer
    x = 5,867.80

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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.