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Finding the Fourth Proportional to 259,530.40, 389,295.60 and 257,780.80

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Solution

The fourth proportional to 259,530.40, 389,295.60 and 257,780.80 is: 386,671.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,530.40 : 389,295.60 = 257,780.80 : x
  2. Step 2: Convert to fraction form
    259,530.40/389,295.60 = 257,780.80/x
  3. Step 3: Cross multiply
    259,530.40x = 389,295.60 × 257,780.80
  4. Step 4: Simplify right side
    259,530.40x = 100,352,931,204.48
  5. Step 5: Solve for x
    x = 100,352,931,204.48/259,530.40
  6. Step 6: Final answer
    x = 386,671.20

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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.