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Finding the Fourth Proportional to 103,689.60, 155,698.43 and 78,757.80

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Solution

The fourth proportional to 103,689.60, 155,698.43 and 78,757.80 is: 118,261.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,689.60 : 155,698.43 = 78,757.80 : x
  2. Step 2: Convert to fraction form
    103,689.60/155,698.43 = 78,757.80/x
  3. Step 3: Cross multiply
    103,689.60x = 155,698.43 × 78,757.80
  4. Step 4: Simplify right side
    103,689.60x = 12,262,465,810.25
  5. Step 5: Solve for x
    x = 12,262,465,810.25/103,689.60
  6. Step 6: Final answer
    x = 118,261.29

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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.