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Finding the Fourth Proportional to 764.18, 1,145.88 and 520.98

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Solution

The fourth proportional to 764.18, 1,145.88 and 520.98 is: 781.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.18 : 1,145.88 = 520.98 : x
  2. Step 2: Convert to fraction form
    764.18/1,145.88 = 520.98/x
  3. Step 3: Cross multiply
    764.18x = 1,145.88 × 520.98
  4. Step 4: Simplify right side
    764.18x = 596,980.56
  5. Step 5: Solve for x
    x = 596,980.56/764.18
  6. Step 6: Final answer
    x = 781.20

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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.