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Finding the Fourth Proportional to 570.68, 787.86 and 515.24

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Solution

The fourth proportional to 570.68, 787.86 and 515.24 is: 711.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.68 : 787.86 = 515.24 : x
  2. Step 2: Convert to fraction form
    570.68/787.86 = 515.24/x
  3. Step 3: Cross multiply
    570.68x = 787.86 × 515.24
  4. Step 4: Simplify right side
    570.68x = 405,936.99
  5. Step 5: Solve for x
    x = 405,936.99/570.68
  6. Step 6: Final answer
    x = 711.32

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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.