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Finding the Fourth Proportional to 973.46, 1,343.34 and 553.79

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Solution

The fourth proportional to 973.46, 1,343.34 and 553.79 is: 764.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    973.46 : 1,343.34 = 553.79 : x
  2. Step 2: Convert to fraction form
    973.46/1,343.34 = 553.79/x
  3. Step 3: Cross multiply
    973.46x = 1,343.34 × 553.79
  4. Step 4: Simplify right side
    973.46x = 743,931.62
  5. Step 5: Solve for x
    x = 743,931.62/973.46
  6. Step 6: Final answer
    x = 764.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.