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Finding the Fourth Proportional to 970.84, 1,456.40 and 321.43

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Solution

The fourth proportional to 970.84, 1,456.40 and 321.43 is: 482.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.84 : 1,456.40 = 321.43 : x
  2. Step 2: Convert to fraction form
    970.84/1,456.40 = 321.43/x
  3. Step 3: Cross multiply
    970.84x = 1,456.40 × 321.43
  4. Step 4: Simplify right side
    970.84x = 468,121.76
  5. Step 5: Solve for x
    x = 468,121.76/970.84
  6. Step 6: Final answer
    x = 482.18

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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.