Home / 1,518.80-2,278.19-869.08

Finding the Fourth Proportional to 1,518.80, 2,278.19 and 869.08

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Solution

The fourth proportional to 1,518.80, 2,278.19 and 869.08 is: 1,303.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,518.80 : 2,278.19 = 869.08 : x
  2. Step 2: Convert to fraction form
    1,518.80/2,278.19 = 869.08/x
  3. Step 3: Cross multiply
    1,518.80x = 2,278.19 × 869.08
  4. Step 4: Simplify right side
    1,518.80x = 1,979,925.84
  5. Step 5: Solve for x
    x = 1,979,925.84/1,518.80
  6. Step 6: Final answer
    x = 1,303.61

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1.5x scale

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.