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Finding the Fourth Proportional to 621.50, 931.16 and 436.01

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Solution

The fourth proportional to 621.50, 931.16 and 436.01 is: 653.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.50 : 931.16 = 436.01 : x
  2. Step 2: Convert to fraction form
    621.50/931.16 = 436.01/x
  3. Step 3: Cross multiply
    621.50x = 931.16 × 436.01
  4. Step 4: Simplify right side
    621.50x = 405,991.51
  5. Step 5: Solve for x
    x = 405,991.51/621.50
  6. Step 6: Final answer
    x = 653.25

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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.