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Finding the Fourth Proportional to 287.77, 431.76 and 125.47

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Solution

The fourth proportional to 287.77, 431.76 and 125.47 is: 188.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.77 : 431.76 = 125.47 : x
  2. Step 2: Convert to fraction form
    287.77/431.76 = 125.47/x
  3. Step 3: Cross multiply
    287.77x = 431.76 × 125.47
  4. Step 4: Simplify right side
    287.77x = 54,172.93
  5. Step 5: Solve for x
    x = 54,172.93/287.77
  6. Step 6: Final answer
    x = 188.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.