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Finding the Fourth Proportional to 642,978,020.30, 964,467,030.45 and 638,443,057.10

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Solution

The fourth proportional to 642,978,020.30, 964,467,030.45 and 638,443,057.10 is: 957,664,585.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,978,020.30 : 964,467,030.45 = 638,443,057.10 : x
  2. Step 2: Convert to fraction form
    642,978,020.30/964,467,030.45 = 638,443,057.10/x
  3. Step 3: Cross multiply
    642,978,020.30x = 964,467,030.45 × 638,443,057.10
  4. Step 4: Simplify right side
    642,978,020.30x = 615,757,279,392,656,896
  5. Step 5: Solve for x
    x = 615,757,279,392,656,896/642,978,020.30
  6. Step 6: Final answer
    x = 957,664,585.65

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Double scale
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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.