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Finding the Fourth Proportional to 522,988,357.94, 721,774,912.44 and 390,599,512.74

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Solution

The fourth proportional to 522,988,357.94, 721,774,912.44 and 390,599,512.74 is: 539,065,401.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    522,988,357.94 : 721,774,912.44 = 390,599,512.74 : x
  2. Step 2: Convert to fraction form
    522,988,357.94/721,774,912.44 = 390,599,512.74/x
  3. Step 3: Cross multiply
    522,988,357.94x = 721,774,912.44 × 390,599,512.74
  4. Step 4: Simplify right side
    522,988,357.94x = 281,924,929,107,020,192
  5. Step 5: Solve for x
    x = 281,924,929,107,020,192/522,988,357.94
  6. Step 6: Final answer
    x = 539,065,401.41

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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.