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Finding the Fourth Proportional to 678.13, 935.77 and 383.40

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Solution

The fourth proportional to 678.13, 935.77 and 383.40 is: 529.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.13 : 935.77 = 383.40 : x
  2. Step 2: Convert to fraction form
    678.13/935.77 = 383.40/x
  3. Step 3: Cross multiply
    678.13x = 935.77 × 383.40
  4. Step 4: Simplify right side
    678.13x = 358,774.22
  5. Step 5: Solve for x
    x = 358,774.22/678.13
  6. Step 6: Final answer
    x = 529.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.