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Finding the Fourth Proportional to 688.51, 1,037.95 and 641.53

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Solution

The fourth proportional to 688.51, 1,037.95 and 641.53 is: 967.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.51 : 1,037.95 = 641.53 : x
  2. Step 2: Convert to fraction form
    688.51/1,037.95 = 641.53/x
  3. Step 3: Cross multiply
    688.51x = 1,037.95 × 641.53
  4. Step 4: Simplify right side
    688.51x = 665,876.06
  5. Step 5: Solve for x
    x = 665,876.06/688.51
  6. Step 6: Final answer
    x = 967.13

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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.