Home / 1,089.60-1,634.40-440.16

Finding the Fourth Proportional to 1,089.60, 1,634.40 and 440.16

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Solution

The fourth proportional to 1,089.60, 1,634.40 and 440.16 is: 660.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.60 : 1,634.40 = 440.16 : x
  2. Step 2: Convert to fraction form
    1,089.60/1,634.40 = 440.16/x
  3. Step 3: Cross multiply
    1,089.60x = 1,634.40 × 440.16
  4. Step 4: Simplify right side
    1,089.60x = 719,397.50
  5. Step 5: Solve for x
    x = 719,397.50/1,089.60
  6. Step 6: Final answer
    x = 660.24

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Double scale
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Similar ratio
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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.