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Finding the Fourth Proportional to 933.30, 1,398.93 and 385.35

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Solution

The fourth proportional to 933.30, 1,398.93 and 385.35 is: 577.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.30 : 1,398.93 = 385.35 : x
  2. Step 2: Convert to fraction form
    933.30/1,398.93 = 385.35/x
  3. Step 3: Cross multiply
    933.30x = 1,398.93 × 385.35
  4. Step 4: Simplify right side
    933.30x = 539,077.68
  5. Step 5: Solve for x
    x = 539,077.68/933.30
  6. Step 6: Final answer
    x = 577.60

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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.