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Finding the Fourth Proportional to 513.03, 707.38 and 388.45

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Solution

The fourth proportional to 513.03, 707.38 and 388.45 is: 535.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.03 : 707.38 = 388.45 : x
  2. Step 2: Convert to fraction form
    513.03/707.38 = 388.45/x
  3. Step 3: Cross multiply
    513.03x = 707.38 × 388.45
  4. Step 4: Simplify right side
    513.03x = 274,779.88
  5. Step 5: Solve for x
    x = 274,779.88/513.03
  6. Step 6: Final answer
    x = 535.60

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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.