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Finding the Fourth Proportional to 1,279.17, 1,918.47 and 621.03

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Solution

The fourth proportional to 1,279.17, 1,918.47 and 621.03 is: 931.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.17 : 1,918.47 = 621.03 : x
  2. Step 2: Convert to fraction form
    1,279.17/1,918.47 = 621.03/x
  3. Step 3: Cross multiply
    1,279.17x = 1,918.47 × 621.03
  4. Step 4: Simplify right side
    1,279.17x = 1,191,427.42
  5. Step 5: Solve for x
    x = 1,191,427.42/1,279.17
  6. Step 6: Final answer
    x = 931.41

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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.