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Finding the Fourth Proportional to 1,161.78, 1,742.28 and 339.81

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Solution

The fourth proportional to 1,161.78, 1,742.28 and 339.81 is: 509.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161.78 : 1,742.28 = 339.81 : x
  2. Step 2: Convert to fraction form
    1,161.78/1,742.28 = 339.81/x
  3. Step 3: Cross multiply
    1,161.78x = 1,742.28 × 339.81
  4. Step 4: Simplify right side
    1,161.78x = 592,044.17
  5. Step 5: Solve for x
    x = 592,044.17/1,161.78
  6. Step 6: Final answer
    x = 509.60

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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.