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Finding the Fourth Proportional to 72,537,644.40, 108,806,466.60 and 21,419,581.20

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Solution

The fourth proportional to 72,537,644.40, 108,806,466.60 and 21,419,581.20 is: 32,129,371.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,537,644.40 : 108,806,466.60 = 21,419,581.20 : x
  2. Step 2: Convert to fraction form
    72,537,644.40/108,806,466.60 = 21,419,581.20/x
  3. Step 3: Cross multiply
    72,537,644.40x = 108,806,466.60 × 21,419,581.20
  4. Step 4: Simplify right side
    72,537,644.40x = 2,330,588,946,423,787.50
  5. Step 5: Solve for x
    x = 2,330,588,946,423,787.50/72,537,644.40
  6. Step 6: Final answer
    x = 32,129,371.80

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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.