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Finding the Fourth Proportional to 1,988.29, 2,980.00 and 688.24

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Solution

The fourth proportional to 1,988.29, 2,980.00 and 688.24 is: 1,031.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.29 : 2,980.00 = 688.24 : x
  2. Step 2: Convert to fraction form
    1,988.29/2,980.00 = 688.24/x
  3. Step 3: Cross multiply
    1,988.29x = 2,980.00 × 688.24
  4. Step 4: Simplify right side
    1,988.29x = 2,050,936.86
  5. Step 5: Solve for x
    x = 2,050,936.86/1,988.29
  6. Step 6: Final answer
    x = 1,031.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.