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Finding the Fourth Proportional to 1,028.76, 1,419.52 and 609.24

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Solution

The fourth proportional to 1,028.76, 1,419.52 and 609.24 is: 840.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.76 : 1,419.52 = 609.24 : x
  2. Step 2: Convert to fraction form
    1,028.76/1,419.52 = 609.24/x
  3. Step 3: Cross multiply
    1,028.76x = 1,419.52 × 609.24
  4. Step 4: Simplify right side
    1,028.76x = 864,828.36
  5. Step 5: Solve for x
    x = 864,828.36/1,028.76
  6. Step 6: Final answer
    x = 840.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.