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Finding the Fourth Proportional to 613.77, 920.04 and 407.82

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Solution

The fourth proportional to 613.77, 920.04 and 407.82 is: 611.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.77 : 920.04 = 407.82 : x
  2. Step 2: Convert to fraction form
    613.77/920.04 = 407.82/x
  3. Step 3: Cross multiply
    613.77x = 920.04 × 407.82
  4. Step 4: Simplify right side
    613.77x = 375,210.71
  5. Step 5: Solve for x
    x = 375,210.71/613.77
  6. Step 6: Final answer
    x = 611.32

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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.