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Finding the Fourth Proportional to 615.20, 848.40 and 458.22

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Solution

The fourth proportional to 615.20, 848.40 and 458.22 is: 631.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.20 : 848.40 = 458.22 : x
  2. Step 2: Convert to fraction form
    615.20/848.40 = 458.22/x
  3. Step 3: Cross multiply
    615.20x = 848.40 × 458.22
  4. Step 4: Simplify right side
    615.20x = 388,753.85
  5. Step 5: Solve for x
    x = 388,753.85/615.20
  6. Step 6: Final answer
    x = 631.91

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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.