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Finding the Fourth Proportional to 5,728, 7,904.36 and 3,210.36

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Solution

The fourth proportional to 5,728, 7,904.36 and 3,210.36 is: 4,430.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,728 : 7,904.36 = 3,210.36 : x
  2. Step 2: Convert to fraction form
    5,728/7,904.36 = 3,210.36/x
  3. Step 3: Cross multiply
    5,728x = 7,904.36 × 3,210.36
  4. Step 4: Simplify right side
    5,728x = 25,375,841.17
  5. Step 5: Solve for x
    x = 25,375,841.17/5,728
  6. Step 6: Final answer
    x = 4,430.14

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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.