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Finding the Fourth Proportional to 402,391.19, 555,299.72 and 221,114.80

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Solution

The fourth proportional to 402,391.19, 555,299.72 and 221,114.80 is: 305,138.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,391.19 : 555,299.72 = 221,114.80 : x
  2. Step 2: Convert to fraction form
    402,391.19/555,299.72 = 221,114.80/x
  3. Step 3: Cross multiply
    402,391.19x = 555,299.72 × 221,114.80
  4. Step 4: Simplify right side
    402,391.19x = 122,784,985,052.99
  5. Step 5: Solve for x
    x = 122,784,985,052.99/402,391.19
  6. Step 6: Final answer
    x = 305,138.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.