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Finding the Fourth Proportional to 139,549,693.20, 209,324,539.80 and 90,763,409.40

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Solution

The fourth proportional to 139,549,693.20, 209,324,539.80 and 90,763,409.40 is: 136,145,114.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,549,693.20 : 209,324,539.80 = 90,763,409.40 : x
  2. Step 2: Convert to fraction form
    139,549,693.20/209,324,539.80 = 90,763,409.40/x
  3. Step 3: Cross multiply
    139,549,693.20x = 209,324,539.80 × 90,763,409.40
  4. Step 4: Simplify right side
    139,549,693.20x = 18,999,008,903,333,996
  5. Step 5: Solve for x
    x = 18,999,008,903,333,996/139,549,693.20
  6. Step 6: Final answer
    x = 136,145,114.10

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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.