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Finding the Fourth Proportional to 485.94, 670.77 and 286.77

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Solution

The fourth proportional to 485.94, 670.77 and 286.77 is: 395.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.94 : 670.77 = 286.77 : x
  2. Step 2: Convert to fraction form
    485.94/670.77 = 286.77/x
  3. Step 3: Cross multiply
    485.94x = 670.77 × 286.77
  4. Step 4: Simplify right side
    485.94x = 192,351.93
  5. Step 5: Solve for x
    x = 192,351.93/485.94
  6. Step 6: Final answer
    x = 395.83

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Find fourth proportional to 242.97, 335.38 and 143.38
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Double scale
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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.