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Finding the Fourth Proportional to 449,990,643.88, 621,011,199.96 and 251,740,312.12

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Solution

The fourth proportional to 449,990,643.88, 621,011,199.96 and 251,740,312.12 is: 347,415,119.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    449,990,643.88 : 621,011,199.96 = 251,740,312.12 : x
  2. Step 2: Convert to fraction form
    449,990,643.88/621,011,199.96 = 251,740,312.12/x
  3. Step 3: Cross multiply
    449,990,643.88x = 621,011,199.96 × 251,740,312.12
  4. Step 4: Simplify right side
    449,990,643.88x = 156,333,553,307,946,144
  5. Step 5: Solve for x
    x = 156,333,553,307,946,144/449,990,643.88
  6. Step 6: Final answer
    x = 347,415,119.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.