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Finding the Fourth Proportional to 657.42, 905.40 and 655.40

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Solution

The fourth proportional to 657.42, 905.40 and 655.40 is: 902.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.42 : 905.40 = 655.40 : x
  2. Step 2: Convert to fraction form
    657.42/905.40 = 655.40/x
  3. Step 3: Cross multiply
    657.42x = 905.40 × 655.40
  4. Step 4: Simplify right side
    657.42x = 593,399.16
  5. Step 5: Solve for x
    x = 593,399.16/657.42
  6. Step 6: Final answer
    x = 902.62

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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.