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Finding the Fourth Proportional to 259.34, 386.90 and 257.51

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Solution

The fourth proportional to 259.34, 386.90 and 257.51 is: 384.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.34 : 386.90 = 257.51 : x
  2. Step 2: Convert to fraction form
    259.34/386.90 = 257.51/x
  3. Step 3: Cross multiply
    259.34x = 386.90 × 257.51
  4. Step 4: Simplify right side
    259.34x = 99,627.40
  5. Step 5: Solve for x
    x = 99,627.40/259.34
  6. Step 6: Final answer
    x = 384.16

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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.