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Finding the Fourth Proportional to 615.42, 848.76 and 405.36

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Solution

The fourth proportional to 615.42, 848.76 and 405.36 is: 559.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.42 : 848.76 = 405.36 : x
  2. Step 2: Convert to fraction form
    615.42/848.76 = 405.36/x
  3. Step 3: Cross multiply
    615.42x = 848.76 × 405.36
  4. Step 4: Simplify right side
    615.42x = 344,053.35
  5. Step 5: Solve for x
    x = 344,053.35/615.42
  6. Step 6: Final answer
    x = 559.05

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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.