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Finding the Fourth Proportional to 678.05, 934.65 and 511.99

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Solution

The fourth proportional to 678.05, 934.65 and 511.99 is: 705.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.05 : 934.65 = 511.99 : x
  2. Step 2: Convert to fraction form
    678.05/934.65 = 511.99/x
  3. Step 3: Cross multiply
    678.05x = 934.65 × 511.99
  4. Step 4: Simplify right side
    678.05x = 478,531.45
  5. Step 5: Solve for x
    x = 478,531.45/678.05
  6. Step 6: Final answer
    x = 705.75

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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.