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Finding the Fourth Proportional to 661,120,208.80, 991,680,313.20 and 620,809,424.80

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Solution

The fourth proportional to 661,120,208.80, 991,680,313.20 and 620,809,424.80 is: 931,214,137.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,120,208.80 : 991,680,313.20 = 620,809,424.80 : x
  2. Step 2: Convert to fraction form
    661,120,208.80/991,680,313.20 = 620,809,424.80/x
  3. Step 3: Cross multiply
    661,120,208.80x = 991,680,313.20 × 620,809,424.80
  4. Step 4: Simplify right side
    661,120,208.80x = 615,644,484,823,175,808
  5. Step 5: Solve for x
    x = 615,644,484,823,175,808/661,120,208.80
  6. Step 6: Final answer
    x = 931,214,137.20

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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.