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Finding the Fourth Proportional to 620.68, 931.32 and 255.58

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Solution

The fourth proportional to 620.68, 931.32 and 255.58 is: 383.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.68 : 931.32 = 255.58 : x
  2. Step 2: Convert to fraction form
    620.68/931.32 = 255.58/x
  3. Step 3: Cross multiply
    620.68x = 931.32 × 255.58
  4. Step 4: Simplify right side
    620.68x = 238,026.77
  5. Step 5: Solve for x
    x = 238,026.77/620.68
  6. Step 6: Final answer
    x = 383.49

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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.