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Finding the Fourth Proportional to 5,718.47, 7,890.21 and 3,621.38

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Solution

The fourth proportional to 5,718.47, 7,890.21 and 3,621.38 is: 4,996.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,718.47 : 7,890.21 = 3,621.38 : x
  2. Step 2: Convert to fraction form
    5,718.47/7,890.21 = 3,621.38/x
  3. Step 3: Cross multiply
    5,718.47x = 7,890.21 × 3,621.38
  4. Step 4: Simplify right side
    5,718.47x = 28,573,409.24
  5. Step 5: Solve for x
    x = 28,573,409.24/5,718.47
  6. Step 6: Final answer
    x = 4,996.69

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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.