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Finding the Fourth Proportional to 572.81, 862.60 and 515.70

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Solution

The fourth proportional to 572.81, 862.60 and 515.70 is: 776.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.81 : 862.60 = 515.70 : x
  2. Step 2: Convert to fraction form
    572.81/862.60 = 515.70/x
  3. Step 3: Cross multiply
    572.81x = 862.60 × 515.70
  4. Step 4: Simplify right side
    572.81x = 444,841.53
  5. Step 5: Solve for x
    x = 444,841.53/572.81
  6. Step 6: Final answer
    x = 776.60

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.