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Finding the Fourth Proportional to 287.07, 430.47 and 104.28

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Solution

The fourth proportional to 287.07, 430.47 and 104.28 is: 156.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.07 : 430.47 = 104.28 : x
  2. Step 2: Convert to fraction form
    287.07/430.47 = 104.28/x
  3. Step 3: Cross multiply
    287.07x = 430.47 × 104.28
  4. Step 4: Simplify right side
    287.07x = 44,889.41
  5. Step 5: Solve for x
    x = 44,889.41/287.07
  6. Step 6: Final answer
    x = 156.37

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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.