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Finding the Fourth Proportional to 139,188.48, 208,775.16 and 85,890.62

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Solution

The fourth proportional to 139,188.48, 208,775.16 and 85,890.62 is: 128,831.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,188.48 : 208,775.16 = 85,890.62 : x
  2. Step 2: Convert to fraction form
    139,188.48/208,775.16 = 85,890.62/x
  3. Step 3: Cross multiply
    139,188.48x = 208,775.16 × 85,890.62
  4. Step 4: Simplify right side
    139,188.48x = 17,931,827,933.00
  5. Step 5: Solve for x
    x = 17,931,827,933.00/139,188.48
  6. Step 6: Final answer
    x = 128,831.26

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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.