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Finding the Fourth Proportional to 1,728.41, 2,590.92 and 688.10

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Solution

The fourth proportional to 1,728.41, 2,590.92 and 688.10 is: 1,031.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,728.41 : 2,590.92 = 688.10 : x
  2. Step 2: Convert to fraction form
    1,728.41/2,590.92 = 688.10/x
  3. Step 3: Cross multiply
    1,728.41x = 2,590.92 × 688.10
  4. Step 4: Simplify right side
    1,728.41x = 1,782,799.10
  5. Step 5: Solve for x
    x = 1,782,799.10/1,728.41
  6. Step 6: Final answer
    x = 1,031.47

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1.5x scale

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.