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Finding the Fourth Proportional to 525.40, 725.22 and 315.64

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Solution

The fourth proportional to 525.40, 725.22 and 315.64 is: 435.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    525.40 : 725.22 = 315.64 : x
  2. Step 2: Convert to fraction form
    525.40/725.22 = 315.64/x
  3. Step 3: Cross multiply
    525.40x = 725.22 × 315.64
  4. Step 4: Simplify right side
    525.40x = 228,908.44
  5. Step 5: Solve for x
    x = 228,908.44/525.40
  6. Step 6: Final answer
    x = 435.68

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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.