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Finding the Fourth Proportional to 618.76, 853.89 and 339.01

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Solution

The fourth proportional to 618.76, 853.89 and 339.01 is: 467.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.76 : 853.89 = 339.01 : x
  2. Step 2: Convert to fraction form
    618.76/853.89 = 339.01/x
  3. Step 3: Cross multiply
    618.76x = 853.89 × 339.01
  4. Step 4: Simplify right side
    618.76x = 289,477.25
  5. Step 5: Solve for x
    x = 289,477.25/618.76
  6. Step 6: Final answer
    x = 467.83

Related Problems

Find fourth proportional to 309.38, 426.95 and 169.51
Half scale
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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.