Home / 1,288.13-1,931.99-557.91

Finding the Fourth Proportional to 1,288.13, 1,931.99 and 557.91

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Solution

The fourth proportional to 1,288.13, 1,931.99 and 557.91 is: 836.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.13 : 1,931.99 = 557.91 : x
  2. Step 2: Convert to fraction form
    1,288.13/1,931.99 = 557.91/x
  3. Step 3: Cross multiply
    1,288.13x = 1,931.99 × 557.91
  4. Step 4: Simplify right side
    1,288.13x = 1,077,873.75
  5. Step 5: Solve for x
    x = 1,077,873.75/1,288.13
  6. Step 6: Final answer
    x = 836.78

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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.