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Finding the Fourth Proportional to 615.18, 848.79 and 408.18

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Solution

The fourth proportional to 615.18, 848.79 and 408.18 is: 563.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.18 : 848.79 = 408.18 : x
  2. Step 2: Convert to fraction form
    615.18/848.79 = 408.18/x
  3. Step 3: Cross multiply
    615.18x = 848.79 × 408.18
  4. Step 4: Simplify right side
    615.18x = 346,459.10
  5. Step 5: Solve for x
    x = 346,459.10/615.18
  6. Step 6: Final answer
    x = 563.18

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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.