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Finding the Fourth Proportional to 1,047.63, 1,445.78 and 649.38

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Solution

The fourth proportional to 1,047.63, 1,445.78 and 649.38 is: 896.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,047.63 : 1,445.78 = 649.38 : x
  2. Step 2: Convert to fraction form
    1,047.63/1,445.78 = 649.38/x
  3. Step 3: Cross multiply
    1,047.63x = 1,445.78 × 649.38
  4. Step 4: Simplify right side
    1,047.63x = 938,867.66
  5. Step 5: Solve for x
    x = 938,867.66/1,047.63
  6. Step 6: Final answer
    x = 896.18

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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.