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Finding the Third Proportional to 129,298,776 and 287,295,420

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Solution

The third proportional to 129,298,776 and 287,295,420 is: 638,356,068.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,298,776 : 287,295,420 = 287,295,420 : x
  2. Step 2: Convert to fraction form
    129,298,776/287,295,420 = 287,295,420/x
  3. Step 3: Cross multiply
    129,298,776x = 287,295,420 × 287,295,420
  4. Step 4: Simplify right side
    129,298,776x = 82,538,658,352,976,400
  5. Step 5: Solve for x
    x = 82,538,658,352,976,400/129,298,776
  6. Step 6: Final answer
    x = 638,356,068.84

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Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.