Home / 1,509.12-2,081.96-1,005.20

Finding the Fourth Proportional to 1,509.12, 2,081.96 and 1,005.20

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Solution

The fourth proportional to 1,509.12, 2,081.96 and 1,005.20 is: 1,386.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,509.12 : 2,081.96 = 1,005.20 : x
  2. Step 2: Convert to fraction form
    1,509.12/2,081.96 = 1,005.20/x
  3. Step 3: Cross multiply
    1,509.12x = 2,081.96 × 1,005.20
  4. Step 4: Simplify right side
    1,509.12x = 2,092,786.19
  5. Step 5: Solve for x
    x = 2,092,786.19/1,509.12
  6. Step 6: Final answer
    x = 1,386.76

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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.