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Finding the Fourth Proportional to 1,031.89, 1,423.02 and 783.22

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Solution

The fourth proportional to 1,031.89, 1,423.02 and 783.22 is: 1,080.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,031.89 : 1,423.02 = 783.22 : x
  2. Step 2: Convert to fraction form
    1,031.89/1,423.02 = 783.22/x
  3. Step 3: Cross multiply
    1,031.89x = 1,423.02 × 783.22
  4. Step 4: Simplify right side
    1,031.89x = 1,114,537.72
  5. Step 5: Solve for x
    x = 1,114,537.72/1,031.89
  6. Step 6: Final answer
    x = 1,080.09

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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.