Home / 1,439.60-2,159.40-1,115.60

Finding the Fourth Proportional to 1,439.60, 2,159.40 and 1,115.60

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Solution

The fourth proportional to 1,439.60, 2,159.40 and 1,115.60 is: 1,673.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.60 : 2,159.40 = 1,115.60 : x
  2. Step 2: Convert to fraction form
    1,439.60/2,159.40 = 1,115.60/x
  3. Step 3: Cross multiply
    1,439.60x = 2,159.40 × 1,115.60
  4. Step 4: Simplify right side
    1,439.60x = 2,409,026.64
  5. Step 5: Solve for x
    x = 2,409,026.64/1,439.60
  6. Step 6: Final answer
    x = 1,673.40

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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.