Home / 1,287.55-1,931.66-557.64

Finding the Fourth Proportional to 1,287.55, 1,931.66 and 557.64

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Solution

The fourth proportional to 1,287.55, 1,931.66 and 557.64 is: 836.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.55 : 1,931.66 = 557.64 : x
  2. Step 2: Convert to fraction form
    1,287.55/1,931.66 = 557.64/x
  3. Step 3: Cross multiply
    1,287.55x = 1,931.66 × 557.64
  4. Step 4: Simplify right side
    1,287.55x = 1,077,170.88
  5. Step 5: Solve for x
    x = 1,077,170.88/1,287.55
  6. Step 6: Final answer
    x = 836.61

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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.