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Finding the Fourth Proportional to 678.68, 935.72 and 561.12

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Solution

The fourth proportional to 678.68, 935.72 and 561.12 is: 773.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.68 : 935.72 = 561.12 : x
  2. Step 2: Convert to fraction form
    678.68/935.72 = 561.12/x
  3. Step 3: Cross multiply
    678.68x = 935.72 × 561.12
  4. Step 4: Simplify right side
    678.68x = 525,051.21
  5. Step 5: Solve for x
    x = 525,051.21/678.68
  6. Step 6: Final answer
    x = 773.64

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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.