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Finding the Fourth Proportional to 340.64, 469.70 and 257.58

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Solution

The fourth proportional to 340.64, 469.70 and 257.58 is: 355.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.64 : 469.70 = 257.58 : x
  2. Step 2: Convert to fraction form
    340.64/469.70 = 257.58/x
  3. Step 3: Cross multiply
    340.64x = 469.70 × 257.58
  4. Step 4: Simplify right side
    340.64x = 120,985.33
  5. Step 5: Solve for x
    x = 120,985.33/340.64
  6. Step 6: Final answer
    x = 355.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.