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Finding the Fourth Proportional to 615.39, 848.38 and 438.45

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Solution

The fourth proportional to 615.39, 848.38 and 438.45 is: 604.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.39 : 848.38 = 438.45 : x
  2. Step 2: Convert to fraction form
    615.39/848.38 = 438.45/x
  3. Step 3: Cross multiply
    615.39x = 848.38 × 438.45
  4. Step 4: Simplify right side
    615.39x = 371,972.21
  5. Step 5: Solve for x
    x = 371,972.21/615.39
  6. Step 6: Final answer
    x = 604.45

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Double scale
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1.5x scale

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.