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Finding the Fourth Proportional to 577.70, 866.55 and 515.30

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Solution

The fourth proportional to 577.70, 866.55 and 515.30 is: 772.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    577.70 : 866.55 = 515.30 : x
  2. Step 2: Convert to fraction form
    577.70/866.55 = 515.30/x
  3. Step 3: Cross multiply
    577.70x = 866.55 × 515.30
  4. Step 4: Simplify right side
    577.70x = 446,533.22
  5. Step 5: Solve for x
    x = 446,533.22/577.70
  6. Step 6: Final answer
    x = 772.95

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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.