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Finding the Fourth Proportional to 978.54, 1,465.57 and 491.73

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Solution

The fourth proportional to 978.54, 1,465.57 and 491.73 is: 736.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.54 : 1,465.57 = 491.73 : x
  2. Step 2: Convert to fraction form
    978.54/1,465.57 = 491.73/x
  3. Step 3: Cross multiply
    978.54x = 1,465.57 × 491.73
  4. Step 4: Simplify right side
    978.54x = 720,664.74
  5. Step 5: Solve for x
    x = 720,664.74/978.54
  6. Step 6: Final answer
    x = 736.47

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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.