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Finding the Fourth Proportional to 1,121.94, 1,548.36 and 649.98

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Solution

The fourth proportional to 1,121.94, 1,548.36 and 649.98 is: 897.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.94 : 1,548.36 = 649.98 : x
  2. Step 2: Convert to fraction form
    1,121.94/1,548.36 = 649.98/x
  3. Step 3: Cross multiply
    1,121.94x = 1,548.36 × 649.98
  4. Step 4: Simplify right side
    1,121.94x = 1,006,403.03
  5. Step 5: Solve for x
    x = 1,006,403.03/1,121.94
  6. Step 6: Final answer
    x = 897.02

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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.