Home / 78,210.09-117,319.70-30,178.95

Finding the Fourth Proportional to 78,210.09, 117,319.70 and 30,178.95

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Solution

The fourth proportional to 78,210.09, 117,319.70 and 30,178.95 is: 45,270.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,210.09 : 117,319.70 = 30,178.95 : x
  2. Step 2: Convert to fraction form
    78,210.09/117,319.70 = 30,178.95/x
  3. Step 3: Cross multiply
    78,210.09x = 117,319.70 × 30,178.95
  4. Step 4: Simplify right side
    78,210.09x = 3,540,585,360.32
  5. Step 5: Solve for x
    x = 3,540,585,360.32/78,210.09
  6. Step 6: Final answer
    x = 45,270.19

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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.