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Finding the Fourth Proportional to 142.56, 212.76 and 128.93

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Solution

The fourth proportional to 142.56, 212.76 and 128.93 is: 192.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.56 : 212.76 = 128.93 : x
  2. Step 2: Convert to fraction form
    142.56/212.76 = 128.93/x
  3. Step 3: Cross multiply
    142.56x = 212.76 × 128.93
  4. Step 4: Simplify right side
    142.56x = 27,430.08
  5. Step 5: Solve for x
    x = 27,430.08/142.56
  6. Step 6: Final answer
    x = 192.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.