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Finding the Fourth Proportional to 802.63, 1,203.54 and 391.15

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Solution

The fourth proportional to 802.63, 1,203.54 and 391.15 is: 586.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.63 : 1,203.54 = 391.15 : x
  2. Step 2: Convert to fraction form
    802.63/1,203.54 = 391.15/x
  3. Step 3: Cross multiply
    802.63x = 1,203.54 × 391.15
  4. Step 4: Simplify right side
    802.63x = 470,764.67
  5. Step 5: Solve for x
    x = 470,764.67/802.63
  6. Step 6: Final answer
    x = 586.53

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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.