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Finding the Fourth Proportional to 933.15, 1,398.15 and 657.90

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Solution

The fourth proportional to 933.15, 1,398.15 and 657.90 is: 985.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.15 : 1,398.15 = 657.90 : x
  2. Step 2: Convert to fraction form
    933.15/1,398.15 = 657.90/x
  3. Step 3: Cross multiply
    933.15x = 1,398.15 × 657.90
  4. Step 4: Simplify right side
    933.15x = 919,842.89
  5. Step 5: Solve for x
    x = 919,842.89/933.15
  6. Step 6: Final answer
    x = 985.74

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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.