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Finding the Fourth Proportional to 806.95, 1,210.63 and 319.94

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Solution

The fourth proportional to 806.95, 1,210.63 and 319.94 is: 479.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.95 : 1,210.63 = 319.94 : x
  2. Step 2: Convert to fraction form
    806.95/1,210.63 = 319.94/x
  3. Step 3: Cross multiply
    806.95x = 1,210.63 × 319.94
  4. Step 4: Simplify right side
    806.95x = 387,328.96
  5. Step 5: Solve for x
    x = 387,328.96/806.95
  6. Step 6: Final answer
    x = 479.99

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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.