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Finding the Fourth Proportional to 340.04, 469.28 and 257.40

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Solution

The fourth proportional to 340.04, 469.28 and 257.40 is: 355.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.04 : 469.28 = 257.40 : x
  2. Step 2: Convert to fraction form
    340.04/469.28 = 257.40/x
  3. Step 3: Cross multiply
    340.04x = 469.28 × 257.40
  4. Step 4: Simplify right side
    340.04x = 120,792.67
  5. Step 5: Solve for x
    x = 120,792.67/340.04
  6. Step 6: Final answer
    x = 355.23

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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.