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Finding the Fourth Proportional to 139,720.18, 209,582.21 and 39,880.35

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Solution

The fourth proportional to 139,720.18, 209,582.21 and 39,880.35 is: 59,821.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,720.18 : 209,582.21 = 39,880.35 : x
  2. Step 2: Convert to fraction form
    139,720.18/209,582.21 = 39,880.35/x
  3. Step 3: Cross multiply
    139,720.18x = 209,582.21 × 39,880.35
  4. Step 4: Simplify right side
    139,720.18x = 8,358,211,888.57
  5. Step 5: Solve for x
    x = 8,358,211,888.57/139,720.18
  6. Step 6: Final answer
    x = 59,821.08

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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.