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Finding the Fourth Proportional to 618.76, 853.70 and 397.97

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Solution

The fourth proportional to 618.76, 853.70 and 397.97 is: 549.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.76 : 853.70 = 397.97 : x
  2. Step 2: Convert to fraction form
    618.76/853.70 = 397.97/x
  3. Step 3: Cross multiply
    618.76x = 853.70 × 397.97
  4. Step 4: Simplify right side
    618.76x = 339,746.99
  5. Step 5: Solve for x
    x = 339,746.99/618.76
  6. Step 6: Final answer
    x = 549.08

Related Problems

Find fourth proportional to 309.38, 426.85 and 198.99
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.