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Finding the Fourth Proportional to 615.13, 920.40 and 368.47

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Solution

The fourth proportional to 615.13, 920.40 and 368.47 is: 551.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.13 : 920.40 = 368.47 : x
  2. Step 2: Convert to fraction form
    615.13/920.40 = 368.47/x
  3. Step 3: Cross multiply
    615.13x = 920.40 × 368.47
  4. Step 4: Simplify right side
    615.13x = 339,137.88
  5. Step 5: Solve for x
    x = 339,137.88/615.13
  6. Step 6: Final answer
    x = 551.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.