Home / 1,126.45-1,688.05-638.47

Finding the Fourth Proportional to 1,126.45, 1,688.05 and 638.47

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Solution

The fourth proportional to 1,126.45, 1,688.05 and 638.47 is: 956.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.45 : 1,688.05 = 638.47 : x
  2. Step 2: Convert to fraction form
    1,126.45/1,688.05 = 638.47/x
  3. Step 3: Cross multiply
    1,126.45x = 1,688.05 × 638.47
  4. Step 4: Simplify right side
    1,126.45x = 1,077,760.90
  5. Step 5: Solve for x
    x = 1,077,760.90/1,126.45
  6. Step 6: Final answer
    x = 956.78

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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.