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Finding the Fourth Proportional to 802.16, 1,202.78 and 390.78

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Solution

The fourth proportional to 802.16, 1,202.78 and 390.78 is: 585.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.16 : 1,202.78 = 390.78 : x
  2. Step 2: Convert to fraction form
    802.16/1,202.78 = 390.78/x
  3. Step 3: Cross multiply
    802.16x = 1,202.78 × 390.78
  4. Step 4: Simplify right side
    802.16x = 470,020.41
  5. Step 5: Solve for x
    x = 470,020.41/802.16
  6. Step 6: Final answer
    x = 585.95

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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.