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Finding the Fourth Proportional to 429,999.80, 644,999.70 and 217,423.40

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Solution

The fourth proportional to 429,999.80, 644,999.70 and 217,423.40 is: 326,135.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    429,999.80 : 644,999.70 = 217,423.40 : x
  2. Step 2: Convert to fraction form
    429,999.80/644,999.70 = 217,423.40/x
  3. Step 3: Cross multiply
    429,999.80x = 644,999.70 × 217,423.40
  4. Step 4: Simplify right side
    429,999.80x = 140,238,027,772.98
  5. Step 5: Solve for x
    x = 140,238,027,772.98/429,999.80
  6. Step 6: Final answer
    x = 326,135.10

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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.