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Finding the Fourth Proportional to 100.43, 150.40 and 56.99

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Solution

The fourth proportional to 100.43, 150.40 and 56.99 is: 85.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.43 : 150.40 = 56.99 : x
  2. Step 2: Convert to fraction form
    100.43/150.40 = 56.99/x
  3. Step 3: Cross multiply
    100.43x = 150.40 × 56.99
  4. Step 4: Simplify right side
    100.43x = 8,571.30
  5. Step 5: Solve for x
    x = 8,571.30/100.43
  6. Step 6: Final answer
    x = 85.35

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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.