Home / 90,639.88-124,639.40-78,682.28

Finding the Fourth Proportional to 90,639.88, 124,639.40 and 78,682.28

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Solution

The fourth proportional to 90,639.88, 124,639.40 and 78,682.28 is: 108,196.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,639.88 : 124,639.40 = 78,682.28 : x
  2. Step 2: Convert to fraction form
    90,639.88/124,639.40 = 78,682.28/x
  3. Step 3: Cross multiply
    90,639.88x = 124,639.40 × 78,682.28
  4. Step 4: Simplify right side
    90,639.88x = 9,806,912,169.83
  5. Step 5: Solve for x
    x = 9,806,912,169.83/90,639.88
  6. Step 6: Final answer
    x = 108,196.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.