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Finding the Fourth Proportional to 802.77, 1,202.22 and 390.59

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Solution

The fourth proportional to 802.77, 1,202.22 and 390.59 is: 584.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.77 : 1,202.22 = 390.59 : x
  2. Step 2: Convert to fraction form
    802.77/1,202.22 = 390.59/x
  3. Step 3: Cross multiply
    802.77x = 1,202.22 × 390.59
  4. Step 4: Simplify right side
    802.77x = 469,569.10
  5. Step 5: Solve for x
    x = 469,569.10/802.77
  6. Step 6: Final answer
    x = 584.94

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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.