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Finding the Fourth Proportional to 970.76, 1,455.22 and 321.14

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Solution

The fourth proportional to 970.76, 1,455.22 and 321.14 is: 481.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.76 : 1,455.22 = 321.14 : x
  2. Step 2: Convert to fraction form
    970.76/1,455.22 = 321.14/x
  3. Step 3: Cross multiply
    970.76x = 1,455.22 × 321.14
  4. Step 4: Simplify right side
    970.76x = 467,320.47
  5. Step 5: Solve for x
    x = 467,320.47/970.76
  6. Step 6: Final answer
    x = 481.40

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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.