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Finding the Fourth Proportional to 615.15, 918.27 and 522.90

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Solution

The fourth proportional to 615.15, 918.27 and 522.90 is: 780.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.15 : 918.27 = 522.90 : x
  2. Step 2: Convert to fraction form
    615.15/918.27 = 522.90/x
  3. Step 3: Cross multiply
    615.15x = 918.27 × 522.90
  4. Step 4: Simplify right side
    615.15x = 480,163.38
  5. Step 5: Solve for x
    x = 480,163.38/615.15
  6. Step 6: Final answer
    x = 780.56

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.