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Finding the Fourth Proportional to 996,217, 1,374,779.78 and 638,521

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Solution

The fourth proportional to 996,217, 1,374,779.78 and 638,521 is: 881,159.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    996,217 : 1,374,779.78 = 638,521 : x
  2. Step 2: Convert to fraction form
    996,217/1,374,779.78 = 638,521/x
  3. Step 3: Cross multiply
    996,217x = 1,374,779.78 × 638,521
  4. Step 4: Simplify right side
    996,217x = 877,825,759,905.38
  5. Step 5: Solve for x
    x = 877,825,759,905.38/996,217
  6. Step 6: Final answer
    x = 881,159.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.