Home / 1,287.56-1,931.23-507.12

Finding the Fourth Proportional to 1,287.56, 1,931.23 and 507.12

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Solution

The fourth proportional to 1,287.56, 1,931.23 and 507.12 is: 760.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.56 : 1,931.23 = 507.12 : x
  2. Step 2: Convert to fraction form
    1,287.56/1,931.23 = 507.12/x
  3. Step 3: Cross multiply
    1,287.56x = 1,931.23 × 507.12
  4. Step 4: Simplify right side
    1,287.56x = 979,365.36
  5. Step 5: Solve for x
    x = 979,365.36/1,287.56
  6. Step 6: Final answer
    x = 760.64

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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.