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Finding the Fourth Proportional to 5,309.66, 7,329.32 and 3,987.19

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Solution

The fourth proportional to 5,309.66, 7,329.32 and 3,987.19 is: 5,503.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,309.66 : 7,329.32 = 3,987.19 : x
  2. Step 2: Convert to fraction form
    5,309.66/7,329.32 = 3,987.19/x
  3. Step 3: Cross multiply
    5,309.66x = 7,329.32 × 3,987.19
  4. Step 4: Simplify right side
    5,309.66x = 29,223,383.06
  5. Step 5: Solve for x
    x = 29,223,383.06/5,309.66
  6. Step 6: Final answer
    x = 5,503.81

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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.