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Finding the Fourth Proportional to 645.58, 890.80 and 365.77

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Solution

The fourth proportional to 645.58, 890.80 and 365.77 is: 504.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.58 : 890.80 = 365.77 : x
  2. Step 2: Convert to fraction form
    645.58/890.80 = 365.77/x
  3. Step 3: Cross multiply
    645.58x = 890.80 × 365.77
  4. Step 4: Simplify right side
    645.58x = 325,827.92
  5. Step 5: Solve for x
    x = 325,827.92/645.58
  6. Step 6: Final answer
    x = 504.71

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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.