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Finding the Fourth Proportional to 2,609.63, 3,914.13 and 661.85

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Solution

The fourth proportional to 2,609.63, 3,914.13 and 661.85 is: 992.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,609.63 : 3,914.13 = 661.85 : x
  2. Step 2: Convert to fraction form
    2,609.63/3,914.13 = 661.85/x
  3. Step 3: Cross multiply
    2,609.63x = 3,914.13 × 661.85
  4. Step 4: Simplify right side
    2,609.63x = 2,590,547.37
  5. Step 5: Solve for x
    x = 2,590,547.37/2,609.63
  6. Step 6: Final answer
    x = 992.69

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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.