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Finding the Fourth Proportional to 260,038.40, 390,057.60 and 212,799.20

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Solution

The fourth proportional to 260,038.40, 390,057.60 and 212,799.20 is: 319,198.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,038.40 : 390,057.60 = 212,799.20 : x
  2. Step 2: Convert to fraction form
    260,038.40/390,057.60 = 212,799.20/x
  3. Step 3: Cross multiply
    260,038.40x = 390,057.60 × 212,799.20
  4. Step 4: Simplify right side
    260,038.40x = 83,003,945,233.92
  5. Step 5: Solve for x
    x = 83,003,945,233.92/260,038.40
  6. Step 6: Final answer
    x = 319,198.80

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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.