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Finding the Fourth Proportional to 687.51, 1,036.44 and 640.53

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Solution

The fourth proportional to 687.51, 1,036.44 and 640.53 is: 965.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.51 : 1,036.44 = 640.53 : x
  2. Step 2: Convert to fraction form
    687.51/1,036.44 = 640.53/x
  3. Step 3: Cross multiply
    687.51x = 1,036.44 × 640.53
  4. Step 4: Simplify right side
    687.51x = 663,870.91
  5. Step 5: Solve for x
    x = 663,870.91/687.51
  6. Step 6: Final answer
    x = 965.62

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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.