Home / 1,385.20-2,077.78-435.43

Finding the Fourth Proportional to 1,385.20, 2,077.78 and 435.43

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Solution

The fourth proportional to 1,385.20, 2,077.78 and 435.43 is: 653.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.20 : 2,077.78 = 435.43 : x
  2. Step 2: Convert to fraction form
    1,385.20/2,077.78 = 435.43/x
  3. Step 3: Cross multiply
    1,385.20x = 2,077.78 × 435.43
  4. Step 4: Simplify right side
    1,385.20x = 904,717.36
  5. Step 5: Solve for x
    x = 904,717.36/1,385.20
  6. Step 6: Final answer
    x = 653.13

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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.