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Finding the Fourth Proportional to 139,570.23, 209,323.90 and 39,728.21

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Solution

The fourth proportional to 139,570.23, 209,323.90 and 39,728.21 is: 59,583.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,570.23 : 209,323.90 = 39,728.21 : x
  2. Step 2: Convert to fraction form
    139,570.23/209,323.90 = 39,728.21/x
  3. Step 3: Cross multiply
    139,570.23x = 209,323.90 × 39,728.21
  4. Step 4: Simplify right side
    139,570.23x = 8,316,063,857.22
  5. Step 5: Solve for x
    x = 8,316,063,857.22/139,570.23
  6. Step 6: Final answer
    x = 59,583.36

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1.5x scale

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.