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Finding the Fourth Proportional to 540.64, 810.72 and 515.20

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Solution

The fourth proportional to 540.64, 810.72 and 515.20 is: 772.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    540.64 : 810.72 = 515.20 : x
  2. Step 2: Convert to fraction form
    540.64/810.72 = 515.20/x
  3. Step 3: Cross multiply
    540.64x = 810.72 × 515.20
  4. Step 4: Simplify right side
    540.64x = 417,682.94
  5. Step 5: Solve for x
    x = 417,682.94/540.64
  6. Step 6: Final answer
    x = 772.57

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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.