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Finding the Fourth Proportional to 139,409,611.70, 209,114,417.55 and 81,929,419.70

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Solution

The fourth proportional to 139,409,611.70, 209,114,417.55 and 81,929,419.70 is: 122,894,129.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,409,611.70 : 209,114,417.55 = 81,929,419.70 : x
  2. Step 2: Convert to fraction form
    139,409,611.70/209,114,417.55 = 81,929,419.70/x
  3. Step 3: Cross multiply
    139,409,611.70x = 209,114,417.55 × 81,929,419.70
  4. Step 4: Simplify right side
    139,409,611.70x = 17,132,622,880,774,998
  5. Step 5: Solve for x
    x = 17,132,622,880,774,998/139,409,611.70
  6. Step 6: Final answer
    x = 122,894,129.55

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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.