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Finding the Fourth Proportional to 1,031.78, 1,547.70 and 262.28

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Solution

The fourth proportional to 1,031.78, 1,547.70 and 262.28 is: 393.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,031.78 : 1,547.70 = 262.28 : x
  2. Step 2: Convert to fraction form
    1,031.78/1,547.70 = 262.28/x
  3. Step 3: Cross multiply
    1,031.78x = 1,547.70 × 262.28
  4. Step 4: Simplify right side
    1,031.78x = 405,930.76
  5. Step 5: Solve for x
    x = 405,930.76/1,031.78
  6. Step 6: Final answer
    x = 393.43

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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.