Home / 7,371.28-10,172.10-5,390.20

Finding the Fourth Proportional to 7,371.28, 10,172.10 and 5,390.20

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Solution

The fourth proportional to 7,371.28, 10,172.10 and 5,390.20 is: 7,438.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,371.28 : 10,172.10 = 5,390.20 : x
  2. Step 2: Convert to fraction form
    7,371.28/10,172.10 = 5,390.20/x
  3. Step 3: Cross multiply
    7,371.28x = 10,172.10 × 5,390.20
  4. Step 4: Simplify right side
    7,371.28x = 54,829,653.42
  5. Step 5: Solve for x
    x = 54,829,653.42/7,371.28
  6. Step 6: Final answer
    x = 7,438.28

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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.