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Finding the Fourth Proportional to 7,151.36, 9,868.73 and 3,921.21

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Solution

The fourth proportional to 7,151.36, 9,868.73 and 3,921.21 is: 5,411.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,151.36 : 9,868.73 = 3,921.21 : x
  2. Step 2: Convert to fraction form
    7,151.36/9,868.73 = 3,921.21/x
  3. Step 3: Cross multiply
    7,151.36x = 9,868.73 × 3,921.21
  4. Step 4: Simplify right side
    7,151.36x = 38,697,343.16
  5. Step 5: Solve for x
    x = 38,697,343.16/7,151.36
  6. Step 6: Final answer
    x = 5,411.19

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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.