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Finding the Fourth Proportional to 307,638.90, 429,644.70 and 307,638.90

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Solution

The fourth proportional to 307,638.90, 429,644.70 and 307,638.90 is: 429,644.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    307,638.90 : 429,644.70 = 307,638.90 : x
  2. Step 2: Convert to fraction form
    307,638.90/429,644.70 = 307,638.90/x
  3. Step 3: Cross multiply
    307,638.90x = 429,644.70 × 307,638.90
  4. Step 4: Simplify right side
    307,638.90x = 132,175,422,898.83
  5. Step 5: Solve for x
    x = 132,175,422,898.83/307,638.90
  6. Step 6: Final answer
    x = 429,644.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.