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Finding the Fourth Proportional to 1,687.50, 2,329.02 and 988.74

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Solution

The fourth proportional to 1,687.50, 2,329.02 and 988.74 is: 1,364.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.50 : 2,329.02 = 988.74 : x
  2. Step 2: Convert to fraction form
    1,687.50/2,329.02 = 988.74/x
  3. Step 3: Cross multiply
    1,687.50x = 2,329.02 × 988.74
  4. Step 4: Simplify right side
    1,687.50x = 2,302,795.23
  5. Step 5: Solve for x
    x = 2,302,795.23/1,687.50
  6. Step 6: Final answer
    x = 1,364.62

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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.