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Finding the Fourth Proportional to 839.26, 1,158.18 and 485.26

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Solution

The fourth proportional to 839.26, 1,158.18 and 485.26 is: 669.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.26 : 1,158.18 = 485.26 : x
  2. Step 2: Convert to fraction form
    839.26/1,158.18 = 485.26/x
  3. Step 3: Cross multiply
    839.26x = 1,158.18 × 485.26
  4. Step 4: Simplify right side
    839.26x = 562,018.43
  5. Step 5: Solve for x
    x = 562,018.43/839.26
  6. Step 6: Final answer
    x = 669.66

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Double scale
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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.