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Finding the Fourth Proportional to 925.64, 1,275.21 and 645.37

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Solution

The fourth proportional to 925.64, 1,275.21 and 645.37 is: 889.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.64 : 1,275.21 = 645.37 : x
  2. Step 2: Convert to fraction form
    925.64/1,275.21 = 645.37/x
  3. Step 3: Cross multiply
    925.64x = 1,275.21 × 645.37
  4. Step 4: Simplify right side
    925.64x = 822,982.28
  5. Step 5: Solve for x
    x = 822,982.28/925.64
  6. Step 6: Final answer
    x = 889.10

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1.5x scale

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.