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Finding the Fourth Proportional to 933.55, 1,400.01 and 780.46

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Solution

The fourth proportional to 933.55, 1,400.01 and 780.46 is: 1,170.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.55 : 1,400.01 = 780.46 : x
  2. Step 2: Convert to fraction form
    933.55/1,400.01 = 780.46/x
  3. Step 3: Cross multiply
    933.55x = 1,400.01 × 780.46
  4. Step 4: Simplify right side
    933.55x = 1,092,651.80
  5. Step 5: Solve for x
    x = 1,092,651.80/933.55
  6. Step 6: Final answer
    x = 1,170.43

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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.