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Finding the Fourth Proportional to 50.99, 70.29 and 42.80

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Solution

The fourth proportional to 50.99, 70.29 and 42.80 is: 59.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.99 : 70.29 = 42.80 : x
  2. Step 2: Convert to fraction form
    50.99/70.29 = 42.80/x
  3. Step 3: Cross multiply
    50.99x = 70.29 × 42.80
  4. Step 4: Simplify right side
    50.99x = 3,008.06
  5. Step 5: Solve for x
    x = 3,008.06/50.99
  6. Step 6: Final answer
    x = 59.00

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.