Home / 90,428.72-135,650.64-31,240.40

Finding the Fourth Proportional to 90,428.72, 135,650.64 and 31,240.40

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Solution

The fourth proportional to 90,428.72, 135,650.64 and 31,240.40 is: 46,863.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,428.72 : 135,650.64 = 31,240.40 : x
  2. Step 2: Convert to fraction form
    90,428.72/135,650.64 = 31,240.40/x
  3. Step 3: Cross multiply
    90,428.72x = 135,650.64 × 31,240.40
  4. Step 4: Simplify right side
    90,428.72x = 4,237,780,253.86
  5. Step 5: Solve for x
    x = 4,237,780,253.86/90,428.72
  6. Step 6: Final answer
    x = 46,863.21

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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.