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Finding the Fourth Proportional to 615.40, 923.10 and 396.70

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Solution

The fourth proportional to 615.40, 923.10 and 396.70 is: 595.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.40 : 923.10 = 396.70 : x
  2. Step 2: Convert to fraction form
    615.40/923.10 = 396.70/x
  3. Step 3: Cross multiply
    615.40x = 923.10 × 396.70
  4. Step 4: Simplify right side
    615.40x = 366,193.77
  5. Step 5: Solve for x
    x = 366,193.77/615.40
  6. Step 6: Final answer
    x = 595.05

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

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.