Home / 1,287.48-1,931.73-557.57

Finding the Fourth Proportional to 1,287.48, 1,931.73 and 557.57

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Solution

The fourth proportional to 1,287.48, 1,931.73 and 557.57 is: 836.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.48 : 1,931.73 = 557.57 : x
  2. Step 2: Convert to fraction form
    1,287.48/1,931.73 = 557.57/x
  3. Step 3: Cross multiply
    1,287.48x = 1,931.73 × 557.57
  4. Step 4: Simplify right side
    1,287.48x = 1,077,074.70
  5. Step 5: Solve for x
    x = 1,077,074.70/1,287.48
  6. Step 6: Final answer
    x = 836.58

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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.