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Finding the Fourth Proportional to 215,685.90, 297,640.71 and 120,186.90

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Solution

The fourth proportional to 215,685.90, 297,640.71 and 120,186.90 is: 165,854.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,685.90 : 297,640.71 = 120,186.90 : x
  2. Step 2: Convert to fraction form
    215,685.90/297,640.71 = 120,186.90/x
  3. Step 3: Cross multiply
    215,685.90x = 297,640.71 × 120,186.90
  4. Step 4: Simplify right side
    215,685.90x = 35,772,514,248.70
  5. Step 5: Solve for x
    x = 35,772,514,248.70/215,685.90
  6. Step 6: Final answer
    x = 165,854.67

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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.