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Finding the Fourth Proportional to 606.55, 909.83 and 390.28

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Solution

The fourth proportional to 606.55, 909.83 and 390.28 is: 585.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    606.55 : 909.83 = 390.28 : x
  2. Step 2: Convert to fraction form
    606.55/909.83 = 390.28/x
  3. Step 3: Cross multiply
    606.55x = 909.83 × 390.28
  4. Step 4: Simplify right side
    606.55x = 355,088.45
  5. Step 5: Solve for x
    x = 355,088.45/606.55
  6. Step 6: Final answer
    x = 585.42

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Double scale
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Similar ratio
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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.