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Finding the Fourth Proportional to 973.20, 1,342.90 and 553.40

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Solution

The fourth proportional to 973.20, 1,342.90 and 553.40 is: 763.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    973.20 : 1,342.90 = 553.40 : x
  2. Step 2: Convert to fraction form
    973.20/1,342.90 = 553.40/x
  3. Step 3: Cross multiply
    973.20x = 1,342.90 × 553.40
  4. Step 4: Simplify right side
    973.20x = 743,160.86
  5. Step 5: Solve for x
    x = 743,160.86/973.20
  6. Step 6: Final answer
    x = 763.63

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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.