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Finding the Fourth Proportional to 5,718.72, 7,898.40 and 4,389.60

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Solution

The fourth proportional to 5,718.72, 7,898.40 and 4,389.60 is: 6,062.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,718.72 : 7,898.40 = 4,389.60 : x
  2. Step 2: Convert to fraction form
    5,718.72/7,898.40 = 4,389.60/x
  3. Step 3: Cross multiply
    5,718.72x = 7,898.40 × 4,389.60
  4. Step 4: Simplify right side
    5,718.72x = 34,670,816.64
  5. Step 5: Solve for x
    x = 34,670,816.64/5,718.72
  6. Step 6: Final answer
    x = 6,062.69

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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.