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Finding the Fourth Proportional to 897.40, 1,238.66 and 631.90

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Solution

The fourth proportional to 897.40, 1,238.66 and 631.90 is: 872.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.40 : 1,238.66 = 631.90 : x
  2. Step 2: Convert to fraction form
    897.40/1,238.66 = 631.90/x
  3. Step 3: Cross multiply
    897.40x = 1,238.66 × 631.90
  4. Step 4: Simplify right side
    897.40x = 782,709.25
  5. Step 5: Solve for x
    x = 782,709.25/897.40
  6. Step 6: Final answer
    x = 872.20

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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.