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Finding the Fourth Proportional to 978.69, 1,350.07 and 684.66

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Solution

The fourth proportional to 978.69, 1,350.07 and 684.66 is: 944.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.69 : 1,350.07 = 684.66 : x
  2. Step 2: Convert to fraction form
    978.69/1,350.07 = 684.66/x
  3. Step 3: Cross multiply
    978.69x = 1,350.07 × 684.66
  4. Step 4: Simplify right side
    978.69x = 924,338.93
  5. Step 5: Solve for x
    x = 924,338.93/978.69
  6. Step 6: Final answer
    x = 944.47

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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.