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Finding the Fourth Proportional to 802.35, 1,107.25 and 470.78

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Solution

The fourth proportional to 802.35, 1,107.25 and 470.78 is: 649.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.35 : 1,107.25 = 470.78 : x
  2. Step 2: Convert to fraction form
    802.35/1,107.25 = 470.78/x
  3. Step 3: Cross multiply
    802.35x = 1,107.25 × 470.78
  4. Step 4: Simplify right side
    802.35x = 521,268.80
  5. Step 5: Solve for x
    x = 521,268.80/802.35
  6. Step 6: Final answer
    x = 649.68

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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.