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Finding the Fourth Proportional to 933.68, 1,398.60 and 609.20

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Solution

The fourth proportional to 933.68, 1,398.60 and 609.20 is: 912.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.68 : 1,398.60 = 609.20 : x
  2. Step 2: Convert to fraction form
    933.68/1,398.60 = 609.20/x
  3. Step 3: Cross multiply
    933.68x = 1,398.60 × 609.20
  4. Step 4: Simplify right side
    933.68x = 852,027.12
  5. Step 5: Solve for x
    x = 852,027.12/933.68
  6. Step 6: Final answer
    x = 912.55

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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.