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Finding the Fourth Proportional to 1,145.31, 1,717.98 and 279.63

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Solution

The fourth proportional to 1,145.31, 1,717.98 and 279.63 is: 419.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.31 : 1,717.98 = 279.63 : x
  2. Step 2: Convert to fraction form
    1,145.31/1,717.98 = 279.63/x
  3. Step 3: Cross multiply
    1,145.31x = 1,717.98 × 279.63
  4. Step 4: Simplify right side
    1,145.31x = 480,398.75
  5. Step 5: Solve for x
    x = 480,398.75/1,145.31
  6. Step 6: Final answer
    x = 419.45

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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.