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Finding the Fourth Proportional to 703,320,870.72, 970,640,905.68 and 390,156,052.80

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Solution

The fourth proportional to 703,320,870.72, 970,640,905.68 and 390,156,052.80 is: 538,447,585.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    703,320,870.72 : 970,640,905.68 = 390,156,052.80 : x
  2. Step 2: Convert to fraction form
    703,320,870.72/970,640,905.68 = 390,156,052.80/x
  3. Step 3: Cross multiply
    703,320,870.72x = 970,640,905.68 × 390,156,052.80
  4. Step 4: Simplify right side
    703,320,870.72x = 378,701,424,446,325,888
  5. Step 5: Solve for x
    x = 378,701,424,446,325,888/703,320,870.72
  6. Step 6: Final answer
    x = 538,447,585.18

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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.