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Finding the Fourth Proportional to 157.77, 235.42 and 139.55

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Solution

The fourth proportional to 157.77, 235.42 and 139.55 is: 208.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.77 : 235.42 = 139.55 : x
  2. Step 2: Convert to fraction form
    157.77/235.42 = 139.55/x
  3. Step 3: Cross multiply
    157.77x = 235.42 × 139.55
  4. Step 4: Simplify right side
    157.77x = 32,851.34
  5. Step 5: Solve for x
    x = 32,851.34/157.77
  6. Step 6: Final answer
    x = 208.22

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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.