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Finding the Fourth Proportional to 902.72, 1,245.67 and 666.81

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Solution

The fourth proportional to 902.72, 1,245.67 and 666.81 is: 920.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.72 : 1,245.67 = 666.81 : x
  2. Step 2: Convert to fraction form
    902.72/1,245.67 = 666.81/x
  3. Step 3: Cross multiply
    902.72x = 1,245.67 × 666.81
  4. Step 4: Simplify right side
    902.72x = 830,623.55
  5. Step 5: Solve for x
    x = 830,623.55/902.72
  6. Step 6: Final answer
    x = 920.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.