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Finding the Fourth Proportional to 139,968,690.90, 210,058,012.35 and 71,776,281.30

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Solution

The fourth proportional to 139,968,690.90, 210,058,012.35 and 71,776,281.30 is: 107,718,253.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,690.90 : 210,058,012.35 = 71,776,281.30 : x
  2. Step 2: Convert to fraction form
    139,968,690.90/210,058,012.35 = 71,776,281.30/x
  3. Step 3: Cross multiply
    139,968,690.90x = 210,058,012.35 × 71,776,281.30
  4. Step 4: Simplify right side
    139,968,690.90x = 15,077,182,983,752,474
  5. Step 5: Solve for x
    x = 15,077,182,983,752,474/139,968,690.90
  6. Step 6: Final answer
    x = 107,718,253.90

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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.