Home / 645,745.16-891,105.96-355,329.56

Finding the Fourth Proportional to 645,745.16, 891,105.96 and 355,329.56

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Solution

The fourth proportional to 645,745.16, 891,105.96 and 355,329.56 is: 490,342.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,745.16 : 891,105.96 = 355,329.56 : x
  2. Step 2: Convert to fraction form
    645,745.16/891,105.96 = 355,329.56/x
  3. Step 3: Cross multiply
    645,745.16x = 891,105.96 × 355,329.56
  4. Step 4: Simplify right side
    645,745.16x = 316,636,288,680.18
  5. Step 5: Solve for x
    x = 316,636,288,680.18/645,745.16
  6. Step 6: Final answer
    x = 490,342.49

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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.