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Finding the Fourth Proportional to 933.61, 1,400.42 and 385.65

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Solution

The fourth proportional to 933.61, 1,400.42 and 385.65 is: 578.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.61 : 1,400.42 = 385.65 : x
  2. Step 2: Convert to fraction form
    933.61/1,400.42 = 385.65/x
  3. Step 3: Cross multiply
    933.61x = 1,400.42 × 385.65
  4. Step 4: Simplify right side
    933.61x = 540,071.97
  5. Step 5: Solve for x
    x = 540,071.97/933.61
  6. Step 6: Final answer
    x = 578.48

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Double scale
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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.