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Finding the Fourth Proportional to 925.02, 1,387.08 and 438.21

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Solution

The fourth proportional to 925.02, 1,387.08 and 438.21 is: 657.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.02 : 1,387.08 = 438.21 : x
  2. Step 2: Convert to fraction form
    925.02/1,387.08 = 438.21/x
  3. Step 3: Cross multiply
    925.02x = 1,387.08 × 438.21
  4. Step 4: Simplify right side
    925.02x = 607,832.33
  5. Step 5: Solve for x
    x = 607,832.33/925.02
  6. Step 6: Final answer
    x = 657.10

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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.