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Finding the Fourth Proportional to 114.79, 172.98 and 103.99

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Solution

The fourth proportional to 114.79, 172.98 and 103.99 is: 156.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.79 : 172.98 = 103.99 : x
  2. Step 2: Convert to fraction form
    114.79/172.98 = 103.99/x
  3. Step 3: Cross multiply
    114.79x = 172.98 × 103.99
  4. Step 4: Simplify right side
    114.79x = 17,986.81
  5. Step 5: Solve for x
    x = 17,986.81/114.79
  6. Step 6: Final answer
    x = 156.70

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.