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Finding the Fourth Proportional to 897.59, 1,238.34 and 687.55

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Solution

The fourth proportional to 897.59, 1,238.34 and 687.55 is: 948.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.59 : 1,238.34 = 687.55 : x
  2. Step 2: Convert to fraction form
    897.59/1,238.34 = 687.55/x
  3. Step 3: Cross multiply
    897.59x = 1,238.34 × 687.55
  4. Step 4: Simplify right side
    897.59x = 851,420.67
  5. Step 5: Solve for x
    x = 851,420.67/897.59
  6. Step 6: Final answer
    x = 948.56

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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.