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Finding the Fourth Proportional to 289.99, 434.68 and 143.58

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Solution

The fourth proportional to 289.99, 434.68 and 143.58 is: 215.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.99 : 434.68 = 143.58 : x
  2. Step 2: Convert to fraction form
    289.99/434.68 = 143.58/x
  3. Step 3: Cross multiply
    289.99x = 434.68 × 143.58
  4. Step 4: Simplify right side
    289.99x = 62,411.00
  5. Step 5: Solve for x
    x = 62,411.00/289.99
  6. Step 6: Final answer
    x = 215.22

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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.