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Finding the Fourth Proportional to 685.13, 1,024.56 and 511.91

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Solution

The fourth proportional to 685.13, 1,024.56 and 511.91 is: 765.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.13 : 1,024.56 = 511.91 : x
  2. Step 2: Convert to fraction form
    685.13/1,024.56 = 511.91/x
  3. Step 3: Cross multiply
    685.13x = 1,024.56 × 511.91
  4. Step 4: Simplify right side
    685.13x = 524,482.51
  5. Step 5: Solve for x
    x = 524,482.51/685.13
  6. Step 6: Final answer
    x = 765.52

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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.