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Finding the Fourth Proportional to 260.10, 387.65 and 257.95

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Solution

The fourth proportional to 260.10, 387.65 and 257.95 is: 384.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.10 : 387.65 = 257.95 : x
  2. Step 2: Convert to fraction form
    260.10/387.65 = 257.95/x
  3. Step 3: Cross multiply
    260.10x = 387.65 × 257.95
  4. Step 4: Simplify right side
    260.10x = 99,994.32
  5. Step 5: Solve for x
    x = 99,994.32/260.10
  6. Step 6: Final answer
    x = 384.45

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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.