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Finding the Fourth Proportional to 535.89, 802.45 and 431.28

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Solution

The fourth proportional to 535.89, 802.45 and 431.28 is: 645.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    535.89 : 802.45 = 431.28 : x
  2. Step 2: Convert to fraction form
    535.89/802.45 = 431.28/x
  3. Step 3: Cross multiply
    535.89x = 802.45 × 431.28
  4. Step 4: Simplify right side
    535.89x = 346,080.64
  5. Step 5: Solve for x
    x = 346,080.64/535.89
  6. Step 6: Final answer
    x = 645.81

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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.