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Finding the Fourth Proportional to 139,969,277.70, 209,953,916.55 and 128,064,999.30

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Solution

The fourth proportional to 139,969,277.70, 209,953,916.55 and 128,064,999.30 is: 192,097,498.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,969,277.70 : 209,953,916.55 = 128,064,999.30 : x
  2. Step 2: Convert to fraction form
    139,969,277.70/209,953,916.55 = 128,064,999.30/x
  3. Step 3: Cross multiply
    139,969,277.70x = 209,953,916.55 × 128,064,999.30
  4. Step 4: Simplify right side
    139,969,277.70x = 26,887,748,176,008,008
  5. Step 5: Solve for x
    x = 26,887,748,176,008,008/139,969,277.70
  6. Step 6: Final answer
    x = 192,097,498.95

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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.