Home / 289,021.12-398,864.64-161,689.12

Finding the Fourth Proportional to 289,021.12, 398,864.64 and 161,689.12

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Solution

The fourth proportional to 289,021.12, 398,864.64 and 161,689.12 is: 223,139.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,021.12 : 398,864.64 = 161,689.12 : x
  2. Step 2: Convert to fraction form
    289,021.12/398,864.64 = 161,689.12/x
  3. Step 3: Cross multiply
    289,021.12x = 398,864.64 × 161,689.12
  4. Step 4: Simplify right side
    289,021.12x = 64,492,072,640.72
  5. Step 5: Solve for x
    x = 64,492,072,640.72/289,021.12
  6. Step 6: Final answer
    x = 223,139.65

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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.