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Finding the Fourth Proportional to 693.76, 1,041.20 and 620.48

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Solution

The fourth proportional to 693.76, 1,041.20 and 620.48 is: 931.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.76 : 1,041.20 = 620.48 : x
  2. Step 2: Convert to fraction form
    693.76/1,041.20 = 620.48/x
  3. Step 3: Cross multiply
    693.76x = 1,041.20 × 620.48
  4. Step 4: Simplify right side
    693.76x = 646,043.78
  5. Step 5: Solve for x
    x = 646,043.78/693.76
  6. Step 6: Final answer
    x = 931.22

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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.