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Finding the Fourth Proportional to 913.72, 1,370.89 and 297.45

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Solution

The fourth proportional to 913.72, 1,370.89 and 297.45 is: 446.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.72 : 1,370.89 = 297.45 : x
  2. Step 2: Convert to fraction form
    913.72/1,370.89 = 297.45/x
  3. Step 3: Cross multiply
    913.72x = 1,370.89 × 297.45
  4. Step 4: Simplify right side
    913.72x = 407,771.23
  5. Step 5: Solve for x
    x = 407,771.23/913.72
  6. Step 6: Final answer
    x = 446.28

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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.