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Finding the Fourth Proportional to 618.34, 926.18 and 487.70

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Solution

The fourth proportional to 618.34, 926.18 and 487.70 is: 730.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.34 : 926.18 = 487.70 : x
  2. Step 2: Convert to fraction form
    618.34/926.18 = 487.70/x
  3. Step 3: Cross multiply
    618.34x = 926.18 × 487.70
  4. Step 4: Simplify right side
    618.34x = 451,697.99
  5. Step 5: Solve for x
    x = 451,697.99/618.34
  6. Step 6: Final answer
    x = 730.50

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.