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Finding the Fourth Proportional to 993.43, 1,487.07 and 978.85

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Solution

The fourth proportional to 993.43, 1,487.07 and 978.85 is: 1,465.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.43 : 1,487.07 = 978.85 : x
  2. Step 2: Convert to fraction form
    993.43/1,487.07 = 978.85/x
  3. Step 3: Cross multiply
    993.43x = 1,487.07 × 978.85
  4. Step 4: Simplify right side
    993.43x = 1,455,618.47
  5. Step 5: Solve for x
    x = 1,455,618.47/993.43
  6. Step 6: Final answer
    x = 1,465.25

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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.