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Finding the Fourth Proportional to 689.48, 1,039.62 and 632.07

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Solution

The fourth proportional to 689.48, 1,039.62 and 632.07 is: 953.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.48 : 1,039.62 = 632.07 : x
  2. Step 2: Convert to fraction form
    689.48/1,039.62 = 632.07/x
  3. Step 3: Cross multiply
    689.48x = 1,039.62 × 632.07
  4. Step 4: Simplify right side
    689.48x = 657,112.61
  5. Step 5: Solve for x
    x = 657,112.61/689.48
  6. Step 6: Final answer
    x = 953.06

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.