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Finding the Fourth Proportional to 839.73, 1,158.76 and 485.76

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Solution

The fourth proportional to 839.73, 1,158.76 and 485.76 is: 670.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.73 : 1,158.76 = 485.76 : x
  2. Step 2: Convert to fraction form
    839.73/1,158.76 = 485.76/x
  3. Step 3: Cross multiply
    839.73x = 1,158.76 × 485.76
  4. Step 4: Simplify right side
    839.73x = 562,879.26
  5. Step 5: Solve for x
    x = 562,879.26/839.73
  6. Step 6: Final answer
    x = 670.31

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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.