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Finding the Fourth Proportional to 103,691.40, 155,421.90 and 56,977.80

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Solution

The fourth proportional to 103,691.40, 155,421.90 and 56,977.80 is: 85,403.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,691.40 : 155,421.90 = 56,977.80 : x
  2. Step 2: Convert to fraction form
    103,691.40/155,421.90 = 56,977.80/x
  3. Step 3: Cross multiply
    103,691.40x = 155,421.90 × 56,977.80
  4. Step 4: Simplify right side
    103,691.40x = 8,855,597,933.82
  5. Step 5: Solve for x
    x = 8,855,597,933.82/103,691.40
  6. Step 6: Final answer
    x = 85,403.40

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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.