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Finding the Fourth Proportional to 5,621.69, 8,430.72 and 1,872.47

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Solution

The fourth proportional to 5,621.69, 8,430.72 and 1,872.47 is: 2,808.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,621.69 : 8,430.72 = 1,872.47 : x
  2. Step 2: Convert to fraction form
    5,621.69/8,430.72 = 1,872.47/x
  3. Step 3: Cross multiply
    5,621.69x = 8,430.72 × 1,872.47
  4. Step 4: Simplify right side
    5,621.69x = 15,786,270.28
  5. Step 5: Solve for x
    x = 15,786,270.28/5,621.69
  6. Step 6: Final answer
    x = 2,808.10

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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.