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Finding the Fourth Proportional to 445.12, 614.55 and 305.19

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Solution

The fourth proportional to 445.12, 614.55 and 305.19 is: 421.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.12 : 614.55 = 305.19 : x
  2. Step 2: Convert to fraction form
    445.12/614.55 = 305.19/x
  3. Step 3: Cross multiply
    445.12x = 614.55 × 305.19
  4. Step 4: Simplify right side
    445.12x = 187,554.51
  5. Step 5: Solve for x
    x = 187,554.51/445.12
  6. Step 6: Final answer
    x = 421.36

Related Problems

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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.