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Finding the Fourth Proportional to 139,730.32, 209,607.96 and 39,888.64

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Solution

The fourth proportional to 139,730.32, 209,607.96 and 39,888.64 is: 59,836.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,730.32 : 209,607.96 = 39,888.64 : x
  2. Step 2: Convert to fraction form
    139,730.32/209,607.96 = 39,888.64/x
  3. Step 3: Cross multiply
    139,730.32x = 209,607.96 × 39,888.64
  4. Step 4: Simplify right side
    139,730.32x = 8,360,976,457.57
  5. Step 5: Solve for x
    x = 8,360,976,457.57/139,730.32
  6. Step 6: Final answer
    x = 59,836.52

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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.