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Finding the Fourth Proportional to 620.97, 931.05 and 415.68

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Solution

The fourth proportional to 620.97, 931.05 and 415.68 is: 623.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.97 : 931.05 = 415.68 : x
  2. Step 2: Convert to fraction form
    620.97/931.05 = 415.68/x
  3. Step 3: Cross multiply
    620.97x = 931.05 × 415.68
  4. Step 4: Simplify right side
    620.97x = 387,018.86
  5. Step 5: Solve for x
    x = 387,018.86/620.97
  6. Step 6: Final answer
    x = 623.25

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Double scale
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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.