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Finding the Fourth Proportional to 897.76, 1,238.78 and 548.38

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Solution

The fourth proportional to 897.76, 1,238.78 and 548.38 is: 756.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.76 : 1,238.78 = 548.38 : x
  2. Step 2: Convert to fraction form
    897.76/1,238.78 = 548.38/x
  3. Step 3: Cross multiply
    897.76x = 1,238.78 × 548.38
  4. Step 4: Simplify right side
    897.76x = 679,322.18
  5. Step 5: Solve for x
    x = 679,322.18/897.76
  6. Step 6: Final answer
    x = 756.69

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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.