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Finding the Fourth Proportional to 5,671.65, 7,818.20 and 3,988.47

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Solution

The fourth proportional to 5,671.65, 7,818.20 and 3,988.47 is: 5,497.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,671.65 : 7,818.20 = 3,988.47 : x
  2. Step 2: Convert to fraction form
    5,671.65/7,818.20 = 3,988.47/x
  3. Step 3: Cross multiply
    5,671.65x = 7,818.20 × 3,988.47
  4. Step 4: Simplify right side
    5,671.65x = 31,182,656.15
  5. Step 5: Solve for x
    x = 31,182,656.15/5,671.65
  6. Step 6: Final answer
    x = 5,497.99

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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.