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Finding the Fourth Proportional to 839.54, 1,158.62 and 485.53

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Solution

The fourth proportional to 839.54, 1,158.62 and 485.53 is: 670.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.54 : 1,158.62 = 485.53 : x
  2. Step 2: Convert to fraction form
    839.54/1,158.62 = 485.53/x
  3. Step 3: Cross multiply
    839.54x = 1,158.62 × 485.53
  4. Step 4: Simplify right side
    839.54x = 562,539.44
  5. Step 5: Solve for x
    x = 562,539.44/839.54
  6. Step 6: Final answer
    x = 670.06

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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.