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Finding the Fourth Proportional to 103,689.40, 155,418.90 and 56,975.80

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Solution

The fourth proportional to 103,689.40, 155,418.90 and 56,975.80 is: 85,400.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,689.40 : 155,418.90 = 56,975.80 : x
  2. Step 2: Convert to fraction form
    103,689.40/155,418.90 = 56,975.80/x
  3. Step 3: Cross multiply
    103,689.40x = 155,418.90 × 56,975.80
  4. Step 4: Simplify right side
    103,689.40x = 8,855,116,162.62
  5. Step 5: Solve for x
    x = 8,855,116,162.62/103,689.40
  6. Step 6: Final answer
    x = 85,400.40

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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.