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Finding the Fourth Proportional to 970.62, 1,455.78 and 321.36

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Solution

The fourth proportional to 970.62, 1,455.78 and 321.36 is: 481.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.62 : 1,455.78 = 321.36 : x
  2. Step 2: Convert to fraction form
    970.62/1,455.78 = 321.36/x
  3. Step 3: Cross multiply
    970.62x = 1,455.78 × 321.36
  4. Step 4: Simplify right side
    970.62x = 467,829.46
  5. Step 5: Solve for x
    x = 467,829.46/970.62
  6. Step 6: Final answer
    x = 481.99

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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.