Home / 1,405.44-2,108.16-917.76

Finding the Fourth Proportional to 1,405.44, 2,108.16 and 917.76

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Solution

The fourth proportional to 1,405.44, 2,108.16 and 917.76 is: 1,376.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.44 : 2,108.16 = 917.76 : x
  2. Step 2: Convert to fraction form
    1,405.44/2,108.16 = 917.76/x
  3. Step 3: Cross multiply
    1,405.44x = 2,108.16 × 917.76
  4. Step 4: Simplify right side
    1,405.44x = 1,934,784.92
  5. Step 5: Solve for x
    x = 1,934,784.92/1,405.44
  6. Step 6: Final answer
    x = 1,376.64

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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.