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Finding the Fourth Proportional to 301,531,390.80, 421,283,012.70 and 301,531,390.80

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Solution

The fourth proportional to 301,531,390.80, 421,283,012.70 and 301,531,390.80 is: 421,283,012.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    301,531,390.80 : 421,283,012.70 = 301,531,390.80 : x
  2. Step 2: Convert to fraction form
    301,531,390.80/421,283,012.70 = 301,531,390.80/x
  3. Step 3: Cross multiply
    301,531,390.80x = 421,283,012.70 × 301,531,390.80
  4. Step 4: Simplify right side
    301,531,390.80x = 127,030,052,739,845,072
  5. Step 5: Solve for x
    x = 127,030,052,739,845,072/301,531,390.80
  6. Step 6: Final answer
    x = 421,283,012.70

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.