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Finding the Fourth Proportional to 421,134,653.20, 631,701,979.80 and 421,134,653.20

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Solution

The fourth proportional to 421,134,653.20, 631,701,979.80 and 421,134,653.20 is: 631,701,979.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,134,653.20 : 631,701,979.80 = 421,134,653.20 : x
  2. Step 2: Convert to fraction form
    421,134,653.20/631,701,979.80 = 421,134,653.20/x
  3. Step 3: Cross multiply
    421,134,653.20x = 631,701,979.80 × 421,134,653.20
  4. Step 4: Simplify right side
    421,134,653.20x = 266,031,594,188,826,368
  5. Step 5: Solve for x
    x = 266,031,594,188,826,368/421,134,653.20
  6. Step 6: Final answer
    x = 631,701,979.80

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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.