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Finding the Fourth Proportional to 897.90, 1,238.40 and 661.73

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Solution

The fourth proportional to 897.90, 1,238.40 and 661.73 is: 912.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.90 : 1,238.40 = 661.73 : x
  2. Step 2: Convert to fraction form
    897.90/1,238.40 = 661.73/x
  3. Step 3: Cross multiply
    897.90x = 1,238.40 × 661.73
  4. Step 4: Simplify right side
    897.90x = 819,480.24
  5. Step 5: Solve for x
    x = 819,480.24/897.90
  6. Step 6: Final answer
    x = 912.66

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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.