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Finding the Fourth Proportional to 18,793,943.40, 28,190,915.10 and 13,125,239.40

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Solution

The fourth proportional to 18,793,943.40, 28,190,915.10 and 13,125,239.40 is: 19,687,859.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,793,943.40 : 28,190,915.10 = 13,125,239.40 : x
  2. Step 2: Convert to fraction form
    18,793,943.40/28,190,915.10 = 13,125,239.40/x
  3. Step 3: Cross multiply
    18,793,943.40x = 28,190,915.10 × 13,125,239.40
  4. Step 4: Simplify right side
    18,793,943.40x = 370,012,509,592,575
  5. Step 5: Solve for x
    x = 370,012,509,592,575/18,793,943.40
  6. Step 6: Final answer
    x = 19,687,859.10

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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.