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Finding the Fourth Proportional to 289.80, 432.23 and 260.64

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Solution

The fourth proportional to 289.80, 432.23 and 260.64 is: 388.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.80 : 432.23 = 260.64 : x
  2. Step 2: Convert to fraction form
    289.80/432.23 = 260.64/x
  3. Step 3: Cross multiply
    289.80x = 432.23 × 260.64
  4. Step 4: Simplify right side
    289.80x = 112,655.12
  5. Step 5: Solve for x
    x = 112,655.12/289.80
  6. Step 6: Final answer
    x = 388.73

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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.