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Finding the Fourth Proportional to 925.54, 1,388.31 and 438.34

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Solution

The fourth proportional to 925.54, 1,388.31 and 438.34 is: 657.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.54 : 1,388.31 = 438.34 : x
  2. Step 2: Convert to fraction form
    925.54/1,388.31 = 438.34/x
  3. Step 3: Cross multiply
    925.54x = 1,388.31 × 438.34
  4. Step 4: Simplify right side
    925.54x = 608,551.81
  5. Step 5: Solve for x
    x = 608,551.81/925.54
  6. Step 6: Final answer
    x = 657.51

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Half scale
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Double scale
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Similar ratio
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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.