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Finding the Fourth Proportional to 187.07, 257.90 and 153.90

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Solution

The fourth proportional to 187.07, 257.90 and 153.90 is: 212.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.07 : 257.90 = 153.90 : x
  2. Step 2: Convert to fraction form
    187.07/257.90 = 153.90/x
  3. Step 3: Cross multiply
    187.07x = 257.90 × 153.90
  4. Step 4: Simplify right side
    187.07x = 39,690.04
  5. Step 5: Solve for x
    x = 39,690.04/187.07
  6. Step 6: Final answer
    x = 212.17

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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.