Home / 1,287.55-1,931.46-557.20

Finding the Fourth Proportional to 1,287.55, 1,931.46 and 557.20

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Solution

The fourth proportional to 1,287.55, 1,931.46 and 557.20 is: 835.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.55 : 1,931.46 = 557.20 : x
  2. Step 2: Convert to fraction form
    1,287.55/1,931.46 = 557.20/x
  3. Step 3: Cross multiply
    1,287.55x = 1,931.46 × 557.20
  4. Step 4: Simplify right side
    1,287.55x = 1,076,209.51
  5. Step 5: Solve for x
    x = 1,076,209.51/1,287.55
  6. Step 6: Final answer
    x = 835.86

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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.