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Finding the Fourth Proportional to 139,968,602.40, 210,057,879.60 and 71,776,192.80

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Solution

The fourth proportional to 139,968,602.40, 210,057,879.60 and 71,776,192.80 is: 107,718,121.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,602.40 : 210,057,879.60 = 71,776,192.80 : x
  2. Step 2: Convert to fraction form
    139,968,602.40/210,057,879.60 = 71,776,192.80/x
  3. Step 3: Cross multiply
    139,968,602.40x = 210,057,879.60 × 71,776,192.80
  4. Step 4: Simplify right side
    139,968,602.40x = 15,077,154,865,328,786
  5. Step 5: Solve for x
    x = 15,077,154,865,328,786/139,968,602.40
  6. Step 6: Final answer
    x = 107,718,121.11

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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.