Home / 427,963.15-641,977.53-128,421.91

Finding the Fourth Proportional to 427,963.15, 641,977.53 and 128,421.91

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Solution

The fourth proportional to 427,963.15, 641,977.53 and 128,421.91 is: 192,642.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,963.15 : 641,977.53 = 128,421.91 : x
  2. Step 2: Convert to fraction form
    427,963.15/641,977.53 = 128,421.91/x
  3. Step 3: Cross multiply
    427,963.15x = 641,977.53 × 128,421.91
  4. Step 4: Simplify right side
    427,963.15x = 82,443,980,579.68
  5. Step 5: Solve for x
    x = 82,443,980,579.68/427,963.15
  6. Step 6: Final answer
    x = 192,642.71

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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.