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Finding the Fourth Proportional to 85,981.99, 128,972.89 and 56,392.90

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Solution

The fourth proportional to 85,981.99, 128,972.89 and 56,392.90 is: 84,589.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,981.99 : 128,972.89 = 56,392.90 : x
  2. Step 2: Convert to fraction form
    85,981.99/128,972.89 = 56,392.90/x
  3. Step 3: Cross multiply
    85,981.99x = 128,972.89 × 56,392.90
  4. Step 4: Simplify right side
    85,981.99x = 7,273,155,288.48
  5. Step 5: Solve for x
    x = 7,273,155,288.48/85,981.99
  6. Step 6: Final answer
    x = 84,589.29

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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.