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Finding the Fourth Proportional to 139,698.83, 209,598.93 and 86,328.60

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Solution

The fourth proportional to 139,698.83, 209,598.93 and 86,328.60 is: 129,524.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,698.83 : 209,598.93 = 86,328.60 : x
  2. Step 2: Convert to fraction form
    139,698.83/209,598.93 = 86,328.60/x
  3. Step 3: Cross multiply
    139,698.83x = 209,598.93 × 86,328.60
  4. Step 4: Simplify right side
    139,698.83x = 18,094,382,188.40
  5. Step 5: Solve for x
    x = 18,094,382,188.40/139,698.83
  6. Step 6: Final answer
    x = 129,524.23

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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.