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Finding the Fourth Proportional to 261,621,374.76, 392,489,523.66 and 77,374,486.56

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Solution

The fourth proportional to 261,621,374.76, 392,489,523.66 and 77,374,486.56 is: 116,078,724.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,621,374.76 : 392,489,523.66 = 77,374,486.56 : x
  2. Step 2: Convert to fraction form
    261,621,374.76/392,489,523.66 = 77,374,486.56/x
  3. Step 3: Cross multiply
    261,621,374.76x = 392,489,523.66 × 77,374,486.56
  4. Step 4: Simplify right side
    261,621,374.76x = 30,368,675,373,371,476
  5. Step 5: Solve for x
    x = 30,368,675,373,371,476/261,621,374.76
  6. Step 6: Final answer
    x = 116,078,724.08

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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.