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Finding the Fourth Proportional to 902.48, 1,245.32 and 666.55

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Solution

The fourth proportional to 902.48, 1,245.32 and 666.55 is: 919.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.48 : 1,245.32 = 666.55 : x
  2. Step 2: Convert to fraction form
    902.48/1,245.32 = 666.55/x
  3. Step 3: Cross multiply
    902.48x = 1,245.32 × 666.55
  4. Step 4: Simplify right side
    902.48x = 830,068.05
  5. Step 5: Solve for x
    x = 830,068.05/902.48
  6. Step 6: Final answer
    x = 919.77

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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.