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Finding the Fourth Proportional to 677.65, 935.28 and 415.63

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Solution

The fourth proportional to 677.65, 935.28 and 415.63 is: 573.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.65 : 935.28 = 415.63 : x
  2. Step 2: Convert to fraction form
    677.65/935.28 = 415.63/x
  3. Step 3: Cross multiply
    677.65x = 935.28 × 415.63
  4. Step 4: Simplify right side
    677.65x = 388,730.43
  5. Step 5: Solve for x
    x = 388,730.43/677.65
  6. Step 6: Final answer
    x = 573.64

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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.