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Finding the Fourth Proportional to 525.72, 725.40 and 315.84

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Solution

The fourth proportional to 525.72, 725.40 and 315.84 is: 435.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    525.72 : 725.40 = 315.84 : x
  2. Step 2: Convert to fraction form
    525.72/725.40 = 315.84/x
  3. Step 3: Cross multiply
    525.72x = 725.40 × 315.84
  4. Step 4: Simplify right side
    525.72x = 229,110.34
  5. Step 5: Solve for x
    x = 229,110.34/525.72
  6. Step 6: Final answer
    x = 435.80

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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.