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Finding the Fourth Proportional to 747.02, 1,031.33 and 665.02

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Solution

The fourth proportional to 747.02, 1,031.33 and 665.02 is: 918.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.02 : 1,031.33 = 665.02 : x
  2. Step 2: Convert to fraction form
    747.02/1,031.33 = 665.02/x
  3. Step 3: Cross multiply
    747.02x = 1,031.33 × 665.02
  4. Step 4: Simplify right side
    747.02x = 685,855.08
  5. Step 5: Solve for x
    x = 685,855.08/747.02
  6. Step 6: Final answer
    x = 918.12

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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.