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Finding the Fourth Proportional to 398,689,787.60, 598,034,681.40 and 393,315,016.40

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Solution

The fourth proportional to 398,689,787.60, 598,034,681.40 and 393,315,016.40 is: 589,972,524.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,689,787.60 : 598,034,681.40 = 393,315,016.40 : x
  2. Step 2: Convert to fraction form
    398,689,787.60/598,034,681.40 = 393,315,016.40/x
  3. Step 3: Cross multiply
    398,689,787.60x = 598,034,681.40 × 393,315,016.40
  4. Step 4: Simplify right side
    398,689,787.60x = 235,216,020,522,609,760
  5. Step 5: Solve for x
    x = 235,216,020,522,609,760/398,689,787.60
  6. Step 6: Final answer
    x = 589,972,524.60

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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.