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Finding the Fourth Proportional to 260,031.40, 390,338.70 and 201,128.20

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Solution

The fourth proportional to 260,031.40, 390,338.70 and 201,128.20 is: 301,917.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,031.40 : 390,338.70 = 201,128.20 : x
  2. Step 2: Convert to fraction form
    260,031.40/390,338.70 = 201,128.20/x
  3. Step 3: Cross multiply
    260,031.40x = 390,338.70 × 201,128.20
  4. Step 4: Simplify right side
    260,031.40x = 78,508,120,121.34
  5. Step 5: Solve for x
    x = 78,508,120,121.34/260,031.40
  6. Step 6: Final answer
    x = 301,917.85

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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.