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Finding the Fourth Proportional to 521, 779.95 and 314.95

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Solution

The fourth proportional to 521, 779.95 and 314.95 is: 471.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    521 : 779.95 = 314.95 : x
  2. Step 2: Convert to fraction form
    521/779.95 = 314.95/x
  3. Step 3: Cross multiply
    521x = 779.95 × 314.95
  4. Step 4: Simplify right side
    521x = 245,639.78
  5. Step 5: Solve for x
    x = 245,639.78/521
  6. Step 6: Final answer
    x = 471.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.