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Finding the Fourth Proportional to 1,047.42, 1,445.49 and 627.80

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Solution

The fourth proportional to 1,047.42, 1,445.49 and 627.80 is: 866.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,047.42 : 1,445.49 = 627.80 : x
  2. Step 2: Convert to fraction form
    1,047.42/1,445.49 = 627.80/x
  3. Step 3: Cross multiply
    1,047.42x = 1,445.49 × 627.80
  4. Step 4: Simplify right side
    1,047.42x = 907,471.39
  5. Step 5: Solve for x
    x = 907,471.39/1,047.42
  6. Step 6: Final answer
    x = 866.39

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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.