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Finding the Fourth Proportional to 289.85, 432.45 and 259.16

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Solution

The fourth proportional to 289.85, 432.45 and 259.16 is: 386.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.85 : 432.45 = 259.16 : x
  2. Step 2: Convert to fraction form
    289.85/432.45 = 259.16/x
  3. Step 3: Cross multiply
    289.85x = 432.45 × 259.16
  4. Step 4: Simplify right side
    289.85x = 112,071.58
  5. Step 5: Solve for x
    x = 112,071.58/289.85
  6. Step 6: Final answer
    x = 386.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.