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Finding the Fourth Proportional to 103,790.80, 155,686.20 and 51,302.80

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Solution

The fourth proportional to 103,790.80, 155,686.20 and 51,302.80 is: 76,954.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,790.80 : 155,686.20 = 51,302.80 : x
  2. Step 2: Convert to fraction form
    103,790.80/155,686.20 = 51,302.80/x
  3. Step 3: Cross multiply
    103,790.80x = 155,686.20 × 51,302.80
  4. Step 4: Simplify right side
    103,790.80x = 7,987,137,981.36
  5. Step 5: Solve for x
    x = 7,987,137,981.36/103,790.80
  6. Step 6: Final answer
    x = 76,954.20

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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.