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Finding the Fourth Proportional to 103,790.80, 155,977.80 and 90,960.40

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Solution

The fourth proportional to 103,790.80, 155,977.80 and 90,960.40 is: 136,696.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,790.80 : 155,977.80 = 90,960.40 : x
  2. Step 2: Convert to fraction form
    103,790.80/155,977.80 = 90,960.40/x
  3. Step 3: Cross multiply
    103,790.80x = 155,977.80 × 90,960.40
  4. Step 4: Simplify right side
    103,790.80x = 14,187,803,079.12
  5. Step 5: Solve for x
    x = 14,187,803,079.12/103,790.80
  6. Step 6: Final answer
    x = 136,696.15

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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.