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Finding the Fourth Proportional to 1,687.50, 2,328.75 and 988.88

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Solution

The fourth proportional to 1,687.50, 2,328.75 and 988.88 is: 1,364.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.50 : 2,328.75 = 988.88 : x
  2. Step 2: Convert to fraction form
    1,687.50/2,328.75 = 988.88/x
  3. Step 3: Cross multiply
    1,687.50x = 2,328.75 × 988.88
  4. Step 4: Simplify right side
    1,687.50x = 2,302,842.66
  5. Step 5: Solve for x
    x = 2,302,842.66/1,687.50
  6. Step 6: Final answer
    x = 1,364.65

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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.