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Finding the Fourth Proportional to 806.25, 1,209.51 and 312.63

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Solution

The fourth proportional to 806.25, 1,209.51 and 312.63 is: 469.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.25 : 1,209.51 = 312.63 : x
  2. Step 2: Convert to fraction form
    806.25/1,209.51 = 312.63/x
  3. Step 3: Cross multiply
    806.25x = 1,209.51 × 312.63
  4. Step 4: Simplify right side
    806.25x = 378,129.11
  5. Step 5: Solve for x
    x = 378,129.11/806.25
  6. Step 6: Final answer
    x = 469.00

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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.