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Finding the Fourth Proportional to 802.47, 1,107.46 and 470.78

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Solution

The fourth proportional to 802.47, 1,107.46 and 470.78 is: 649.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.47 : 1,107.46 = 470.78 : x
  2. Step 2: Convert to fraction form
    802.47/1,107.46 = 470.78/x
  3. Step 3: Cross multiply
    802.47x = 1,107.46 × 470.78
  4. Step 4: Simplify right side
    802.47x = 521,364.48
  5. Step 5: Solve for x
    x = 521,364.48/802.47
  6. Step 6: Final answer
    x = 649.70

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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.