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Finding the Fourth Proportional to 677.76, 935.72 and 511.30

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Solution

The fourth proportional to 677.76, 935.72 and 511.30 is: 705.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.76 : 935.72 = 511.30 : x
  2. Step 2: Convert to fraction form
    677.76/935.72 = 511.30/x
  3. Step 3: Cross multiply
    677.76x = 935.72 × 511.30
  4. Step 4: Simplify right side
    677.76x = 478,433.64
  5. Step 5: Solve for x
    x = 478,433.64/677.76
  6. Step 6: Final answer
    x = 705.90

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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.