Home / 645,743.16-891,103.20-355,327.57

Finding the Fourth Proportional to 645,743.16, 891,103.20 and 355,327.57

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Solution

The fourth proportional to 645,743.16, 891,103.20 and 355,327.57 is: 490,339.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,743.16 : 891,103.20 = 355,327.57 : x
  2. Step 2: Convert to fraction form
    645,743.16/891,103.20 = 355,327.57/x
  3. Step 3: Cross multiply
    645,743.16x = 891,103.20 × 355,327.57
  4. Step 4: Simplify right side
    645,743.16x = 316,633,529,444.17
  5. Step 5: Solve for x
    x = 316,633,529,444.17/645,743.16
  6. Step 6: Final answer
    x = 490,339.73

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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.