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Finding the Fourth Proportional to 1,197.10, 1,647.84 and 1,031.86

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Solution

The fourth proportional to 1,197.10, 1,647.84 and 1,031.86 is: 1,420.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,197.10 : 1,647.84 = 1,031.86 : x
  2. Step 2: Convert to fraction form
    1,197.10/1,647.84 = 1,031.86/x
  3. Step 3: Cross multiply
    1,197.10x = 1,647.84 × 1,031.86
  4. Step 4: Simplify right side
    1,197.10x = 1,700,340.18
  5. Step 5: Solve for x
    x = 1,700,340.18/1,197.10
  6. Step 6: Final answer
    x = 1,420.38

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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.