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Finding the Fourth Proportional to 993.28, 1,370.14 and 639.10

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Solution

The fourth proportional to 993.28, 1,370.14 and 639.10 is: 881.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.28 : 1,370.14 = 639.10 : x
  2. Step 2: Convert to fraction form
    993.28/1,370.14 = 639.10/x
  3. Step 3: Cross multiply
    993.28x = 1,370.14 × 639.10
  4. Step 4: Simplify right side
    993.28x = 875,656.47
  5. Step 5: Solve for x
    x = 875,656.47/993.28
  6. Step 6: Final answer
    x = 881.58

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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.