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Finding the Fourth Proportional to 103,690.40, 155,420.40 and 56,976.80

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Solution

The fourth proportional to 103,690.40, 155,420.40 and 56,976.80 is: 85,401.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,690.40 : 155,420.40 = 56,976.80 : x
  2. Step 2: Convert to fraction form
    103,690.40/155,420.40 = 56,976.80/x
  3. Step 3: Cross multiply
    103,690.40x = 155,420.40 × 56,976.80
  4. Step 4: Simplify right side
    103,690.40x = 8,855,357,046.72
  5. Step 5: Solve for x
    x = 8,855,357,046.72/103,690.40
  6. Step 6: Final answer
    x = 85,401.90

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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.