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Finding the Fourth Proportional to 139,968,679.20, 209,953,018.80 and 85,549,120.80

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Solution

The fourth proportional to 139,968,679.20, 209,953,018.80 and 85,549,120.80 is: 128,323,681.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,679.20 : 209,953,018.80 = 85,549,120.80 : x
  2. Step 2: Convert to fraction form
    139,968,679.20/209,953,018.80 = 85,549,120.80/x
  3. Step 3: Cross multiply
    139,968,679.20x = 209,953,018.80 × 85,549,120.80
  4. Step 4: Simplify right side
    139,968,679.20x = 17,961,296,167,645,872
  5. Step 5: Solve for x
    x = 17,961,296,167,645,872/139,968,679.20
  6. Step 6: Final answer
    x = 128,323,681.20

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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.