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Finding the Fourth Proportional to 259,703.70, 389,555.55 and 72,715.20

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Solution

The fourth proportional to 259,703.70, 389,555.55 and 72,715.20 is: 109,072.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,703.70 : 389,555.55 = 72,715.20 : x
  2. Step 2: Convert to fraction form
    259,703.70/389,555.55 = 72,715.20/x
  3. Step 3: Cross multiply
    259,703.70x = 389,555.55 × 72,715.20
  4. Step 4: Simplify right side
    259,703.70x = 28,326,609,729.36
  5. Step 5: Solve for x
    x = 28,326,609,729.36/259,703.70
  6. Step 6: Final answer
    x = 109,072.80

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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.