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Finding the Fourth Proportional to 139,020.72, 208,545.66 and 45,533.76

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Solution

The fourth proportional to 139,020.72, 208,545.66 and 45,533.76 is: 68,305.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,020.72 : 208,545.66 = 45,533.76 : x
  2. Step 2: Convert to fraction form
    139,020.72/208,545.66 = 45,533.76/x
  3. Step 3: Cross multiply
    139,020.72x = 208,545.66 × 45,533.76
  4. Step 4: Simplify right side
    139,020.72x = 9,495,868,031.48
  5. Step 5: Solve for x
    x = 9,495,868,031.48/139,020.72
  6. Step 6: Final answer
    x = 68,305.42

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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.