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Finding the Fourth Proportional to 340.40, 469.40 and 278.12

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Solution

The fourth proportional to 340.40, 469.40 and 278.12 is: 383.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.40 : 469.40 = 278.12 : x
  2. Step 2: Convert to fraction form
    340.40/469.40 = 278.12/x
  3. Step 3: Cross multiply
    340.40x = 469.40 × 278.12
  4. Step 4: Simplify right side
    340.40x = 130,549.53
  5. Step 5: Solve for x
    x = 130,549.53/340.40
  6. Step 6: Final answer
    x = 383.52

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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.