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Finding the Fourth Proportional to 389,368.80, 584,247.60 and 221,018.40

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Solution

The fourth proportional to 389,368.80, 584,247.60 and 221,018.40 is: 331,637.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,368.80 : 584,247.60 = 221,018.40 : x
  2. Step 2: Convert to fraction form
    389,368.80/584,247.60 = 221,018.40/x
  3. Step 3: Cross multiply
    389,368.80x = 584,247.60 × 221,018.40
  4. Step 4: Simplify right side
    389,368.80x = 129,129,469,755.84
  5. Step 5: Solve for x
    x = 129,129,469,755.84/389,368.80
  6. Step 6: Final answer
    x = 331,637.95

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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.