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Finding the Fourth Proportional to 70,008,752.91, 105,013,129.37 and 18,890,689.71

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Solution

The fourth proportional to 70,008,752.91, 105,013,129.37 and 18,890,689.71 is: 28,336,034.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,008,752.91 : 105,013,129.37 = 18,890,689.71 : x
  2. Step 2: Convert to fraction form
    70,008,752.91/105,013,129.37 = 18,890,689.71/x
  3. Step 3: Cross multiply
    70,008,752.91x = 105,013,129.37 × 18,890,689.71
  4. Step 4: Simplify right side
    70,008,752.91x = 1,983,770,442,404,758
  5. Step 5: Solve for x
    x = 1,983,770,442,404,758/70,008,752.91
  6. Step 6: Final answer
    x = 28,336,034.57

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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.