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Finding the Fourth Proportional to 540.32, 745.64 and 319.28

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Solution

The fourth proportional to 540.32, 745.64 and 319.28 is: 440.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    540.32 : 745.64 = 319.28 : x
  2. Step 2: Convert to fraction form
    540.32/745.64 = 319.28/x
  3. Step 3: Cross multiply
    540.32x = 745.64 × 319.28
  4. Step 4: Simplify right side
    540.32x = 238,063.81
  5. Step 5: Solve for x
    x = 238,063.81/540.32
  6. Step 6: Final answer
    x = 440.60

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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.