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Finding the Fourth Proportional to 945.72, 1,418.58 and 621

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Solution

The fourth proportional to 945.72, 1,418.58 and 621 is: 931.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.72 : 1,418.58 = 621 : x
  2. Step 2: Convert to fraction form
    945.72/1,418.58 = 621/x
  3. Step 3: Cross multiply
    945.72x = 1,418.58 × 621
  4. Step 4: Simplify right side
    945.72x = 880,938.18
  5. Step 5: Solve for x
    x = 880,938.18/945.72
  6. Step 6: Final answer
    x = 931.50

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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.