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Finding the Fourth Proportional to 1,121.32, 1,681.98 and 544.36

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Solution

The fourth proportional to 1,121.32, 1,681.98 and 544.36 is: 816.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.32 : 1,681.98 = 544.36 : x
  2. Step 2: Convert to fraction form
    1,121.32/1,681.98 = 544.36/x
  3. Step 3: Cross multiply
    1,121.32x = 1,681.98 × 544.36
  4. Step 4: Simplify right side
    1,121.32x = 915,602.63
  5. Step 5: Solve for x
    x = 915,602.63/1,121.32
  6. Step 6: Final answer
    x = 816.54

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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.