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Finding the Fourth Proportional to 157.00, 216.66 and 87.06

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Solution

The fourth proportional to 157.00, 216.66 and 87.06 is: 120.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.00 : 216.66 = 87.06 : x
  2. Step 2: Convert to fraction form
    157.00/216.66 = 87.06/x
  3. Step 3: Cross multiply
    157.00x = 216.66 × 87.06
  4. Step 4: Simplify right side
    157.00x = 18,862.09
  5. Step 5: Solve for x
    x = 18,862.09/157.00
  6. Step 6: Final answer
    x = 120.14

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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.