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Finding the Fourth Proportional to 807.42, 1,210.03 and 320.20

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Solution

The fourth proportional to 807.42, 1,210.03 and 320.20 is: 479.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.42 : 1,210.03 = 320.20 : x
  2. Step 2: Convert to fraction form
    807.42/1,210.03 = 320.20/x
  3. Step 3: Cross multiply
    807.42x = 1,210.03 × 320.20
  4. Step 4: Simplify right side
    807.42x = 387,451.61
  5. Step 5: Solve for x
    x = 387,451.61/807.42
  6. Step 6: Final answer
    x = 479.86

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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.