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Finding the Fourth Proportional to 612.95, 919.31 and 383.25

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Solution

The fourth proportional to 612.95, 919.31 and 383.25 is: 574.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.95 : 919.31 = 383.25 : x
  2. Step 2: Convert to fraction form
    612.95/919.31 = 383.25/x
  3. Step 3: Cross multiply
    612.95x = 919.31 × 383.25
  4. Step 4: Simplify right side
    612.95x = 352,323.64
  5. Step 5: Solve for x
    x = 352,323.64/612.95
  6. Step 6: Final answer
    x = 574.80

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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.