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Finding the Fourth Proportional to 1,005.04, 1,507.80 and 518.80

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Solution

The fourth proportional to 1,005.04, 1,507.80 and 518.80 is: 778.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.04 : 1,507.80 = 518.80 : x
  2. Step 2: Convert to fraction form
    1,005.04/1,507.80 = 518.80/x
  3. Step 3: Cross multiply
    1,005.04x = 1,507.80 × 518.80
  4. Step 4: Simplify right side
    1,005.04x = 782,246.64
  5. Step 5: Solve for x
    x = 782,246.64/1,005.04
  6. Step 6: Final answer
    x = 778.32

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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.