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Finding the Fourth Proportional to 817.63, 1,127.89 and 522.58

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Solution

The fourth proportional to 817.63, 1,127.89 and 522.58 is: 720.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.63 : 1,127.89 = 522.58 : x
  2. Step 2: Convert to fraction form
    817.63/1,127.89 = 522.58/x
  3. Step 3: Cross multiply
    817.63x = 1,127.89 × 522.58
  4. Step 4: Simplify right side
    817.63x = 589,412.76
  5. Step 5: Solve for x
    x = 589,412.76/817.63
  6. Step 6: Final answer
    x = 720.88

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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.