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Finding the Fourth Proportional to 4,685.82, 7,028.72 and 1,398.90

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Solution

The fourth proportional to 4,685.82, 7,028.72 and 1,398.90 is: 2,098.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,685.82 : 7,028.72 = 1,398.90 : x
  2. Step 2: Convert to fraction form
    4,685.82/7,028.72 = 1,398.90/x
  3. Step 3: Cross multiply
    4,685.82x = 7,028.72 × 1,398.90
  4. Step 4: Simplify right side
    4,685.82x = 9,832,476.41
  5. Step 5: Solve for x
    x = 9,832,476.41/4,685.82
  6. Step 6: Final answer
    x = 2,098.35

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1.5x scale

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.