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Finding the Fourth Proportional to 388,881, 583,379.82 and 139,621.32

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Solution

The fourth proportional to 388,881, 583,379.82 and 139,621.32 is: 209,452.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,881 : 583,379.82 = 139,621.32 : x
  2. Step 2: Convert to fraction form
    388,881/583,379.82 = 139,621.32/x
  3. Step 3: Cross multiply
    388,881x = 583,379.82 × 139,621.32
  4. Step 4: Simplify right side
    388,881x = 81,452,260,529.76
  5. Step 5: Solve for x
    x = 81,452,260,529.76/388,881
  6. Step 6: Final answer
    x = 209,452.92

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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.