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Finding the Fourth Proportional to 90,866.78, 136,322.88 and 31,703.30

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Solution

The fourth proportional to 90,866.78, 136,322.88 and 31,703.30 is: 47,562.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,866.78 : 136,322.88 = 31,703.30 : x
  2. Step 2: Convert to fraction form
    90,866.78/136,322.88 = 31,703.30/x
  3. Step 3: Cross multiply
    90,866.78x = 136,322.88 × 31,703.30
  4. Step 4: Simplify right side
    90,866.78x = 4,321,885,161.50
  5. Step 5: Solve for x
    x = 4,321,885,161.50/90,866.78
  6. Step 6: Final answer
    x = 47,562.87

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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.