Home / 1,319.80-1,821.18-1,057.72

Finding the Fourth Proportional to 1,319.80, 1,821.18 and 1,057.72

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Solution

The fourth proportional to 1,319.80, 1,821.18 and 1,057.72 is: 1,459.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.80 : 1,821.18 = 1,057.72 : x
  2. Step 2: Convert to fraction form
    1,319.80/1,821.18 = 1,057.72/x
  3. Step 3: Cross multiply
    1,319.80x = 1,821.18 × 1,057.72
  4. Step 4: Simplify right side
    1,319.80x = 1,926,298.51
  5. Step 5: Solve for x
    x = 1,926,298.51/1,319.80
  6. Step 6: Final answer
    x = 1,459.54

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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.