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Finding the Fourth Proportional to 103,128.60, 154,619.10 and 39,894.60

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Solution

The fourth proportional to 103,128.60, 154,619.10 and 39,894.60 is: 59,813.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,128.60 : 154,619.10 = 39,894.60 : x
  2. Step 2: Convert to fraction form
    103,128.60/154,619.10 = 39,894.60/x
  3. Step 3: Cross multiply
    103,128.60x = 154,619.10 × 39,894.60
  4. Step 4: Simplify right side
    103,128.60x = 6,168,467,146.86
  5. Step 5: Solve for x
    x = 6,168,467,146.86/103,128.60
  6. Step 6: Final answer
    x = 59,813.35

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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.