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Finding the Fourth Proportional to 802.15, 1,203.33 and 391.23

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Solution

The fourth proportional to 802.15, 1,203.33 and 391.23 is: 586.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.15 : 1,203.33 = 391.23 : x
  2. Step 2: Convert to fraction form
    802.15/1,203.33 = 391.23/x
  3. Step 3: Cross multiply
    802.15x = 1,203.33 × 391.23
  4. Step 4: Simplify right side
    802.15x = 470,778.80
  5. Step 5: Solve for x
    x = 470,778.80/802.15
  6. Step 6: Final answer
    x = 586.90

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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.