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Finding the Fourth Proportional to 821.82, 1,134.15 and 485.91

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Solution

The fourth proportional to 821.82, 1,134.15 and 485.91 is: 670.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.82 : 1,134.15 = 485.91 : x
  2. Step 2: Convert to fraction form
    821.82/1,134.15 = 485.91/x
  3. Step 3: Cross multiply
    821.82x = 1,134.15 × 485.91
  4. Step 4: Simplify right side
    821.82x = 551,094.83
  5. Step 5: Solve for x
    x = 551,094.83/821.82
  6. Step 6: Final answer
    x = 670.58

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1.5x scale

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.