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Finding the Fourth Proportional to 802.88, 1,203.92 and 315.84

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Solution

The fourth proportional to 802.88, 1,203.92 and 315.84 is: 473.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.88 : 1,203.92 = 315.84 : x
  2. Step 2: Convert to fraction form
    802.88/1,203.92 = 315.84/x
  3. Step 3: Cross multiply
    802.88x = 1,203.92 × 315.84
  4. Step 4: Simplify right side
    802.88x = 380,246.09
  5. Step 5: Solve for x
    x = 380,246.09/802.88
  6. Step 6: Final answer
    x = 473.60

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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.