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Finding the Fourth Proportional to 660,386.92, 990,020.78 and 261,309.24

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Solution

The fourth proportional to 660,386.92, 990,020.78 and 261,309.24 is: 391,742.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,386.92 : 990,020.78 = 261,309.24 : x
  2. Step 2: Convert to fraction form
    660,386.92/990,020.78 = 261,309.24/x
  3. Step 3: Cross multiply
    660,386.92x = 990,020.78 × 261,309.24
  4. Step 4: Simplify right side
    660,386.92x = 258,701,577,606.01
  5. Step 5: Solve for x
    x = 258,701,577,606.01/660,386.92
  6. Step 6: Final answer
    x = 391,742.43

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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.