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Finding the Fourth Proportional to 611.34, 843.60 and 390.36

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Solution

The fourth proportional to 611.34, 843.60 and 390.36 is: 538.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.34 : 843.60 = 390.36 : x
  2. Step 2: Convert to fraction form
    611.34/843.60 = 390.36/x
  3. Step 3: Cross multiply
    611.34x = 843.60 × 390.36
  4. Step 4: Simplify right side
    611.34x = 329,307.70
  5. Step 5: Solve for x
    x = 329,307.70/611.34
  6. Step 6: Final answer
    x = 538.67

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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.