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Finding the Fourth Proportional to 7,322.40, 10,999.80 and 5,135.40

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Solution

The fourth proportional to 7,322.40, 10,999.80 and 5,135.40 is: 7,714.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,322.40 : 10,999.80 = 5,135.40 : x
  2. Step 2: Convert to fraction form
    7,322.40/10,999.80 = 5,135.40/x
  3. Step 3: Cross multiply
    7,322.40x = 10,999.80 × 5,135.40
  4. Step 4: Simplify right side
    7,322.40x = 56,488,372.92
  5. Step 5: Solve for x
    x = 56,488,372.92/7,322.40
  6. Step 6: Final answer
    x = 7,714.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.