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Finding the Fourth Proportional to 978.62, 1,466.93 and 613.66

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Solution

The fourth proportional to 978.62, 1,466.93 and 613.66 is: 919.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.62 : 1,466.93 = 613.66 : x
  2. Step 2: Convert to fraction form
    978.62/1,466.93 = 613.66/x
  3. Step 3: Cross multiply
    978.62x = 1,466.93 × 613.66
  4. Step 4: Simplify right side
    978.62x = 900,194.13
  5. Step 5: Solve for x
    x = 900,194.13/978.62
  6. Step 6: Final answer
    x = 919.87

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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.