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Finding the Fourth Proportional to 431,569,389.60, 647,354,084.40 and 428,546,080.80

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Solution

The fourth proportional to 431,569,389.60, 647,354,084.40 and 428,546,080.80 is: 642,819,121.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,569,389.60 : 647,354,084.40 = 428,546,080.80 : x
  2. Step 2: Convert to fraction form
    431,569,389.60/647,354,084.40 = 428,546,080.80/x
  3. Step 3: Cross multiply
    431,569,389.60x = 647,354,084.40 × 428,546,080.80
  4. Step 4: Simplify right side
    431,569,389.60x = 277,421,055,759,492,416
  5. Step 5: Solve for x
    x = 277,421,055,759,492,416/431,569,389.60
  6. Step 6: Final answer
    x = 642,819,121.20

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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.