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Finding the Fourth Proportional to 802.72, 1,107.60 and 487.84

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Solution

The fourth proportional to 802.72, 1,107.60 and 487.84 is: 673.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.72 : 1,107.60 = 487.84 : x
  2. Step 2: Convert to fraction form
    802.72/1,107.60 = 487.84/x
  3. Step 3: Cross multiply
    802.72x = 1,107.60 × 487.84
  4. Step 4: Simplify right side
    802.72x = 540,331.58
  5. Step 5: Solve for x
    x = 540,331.58/802.72
  6. Step 6: Final answer
    x = 673.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.