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Finding the Fourth Proportional to 1,121.49, 1,547.46 and 649.35

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Solution

The fourth proportional to 1,121.49, 1,547.46 and 649.35 is: 895.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.49 : 1,547.46 = 649.35 : x
  2. Step 2: Convert to fraction form
    1,121.49/1,547.46 = 649.35/x
  3. Step 3: Cross multiply
    1,121.49x = 1,547.46 × 649.35
  4. Step 4: Simplify right side
    1,121.49x = 1,004,843.15
  5. Step 5: Solve for x
    x = 1,004,843.15/1,121.49
  6. Step 6: Final answer
    x = 895.99

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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.