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Finding the Fourth Proportional to 287.17, 430.30 and 259.84

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Solution

The fourth proportional to 287.17, 430.30 and 259.84 is: 389.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.17 : 430.30 = 259.84 : x
  2. Step 2: Convert to fraction form
    287.17/430.30 = 259.84/x
  3. Step 3: Cross multiply
    287.17x = 430.30 × 259.84
  4. Step 4: Simplify right side
    287.17x = 111,806.35
  5. Step 5: Solve for x
    x = 111,806.35/287.17
  6. Step 6: Final answer
    x = 389.34

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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.