Home / 78,328.40-117,312.60-64,331.60

Finding the Fourth Proportional to 78,328.40, 117,312.60 and 64,331.60

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Solution

The fourth proportional to 78,328.40, 117,312.60 and 64,331.60 is: 96,349.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,328.40 : 117,312.60 = 64,331.60 : x
  2. Step 2: Convert to fraction form
    78,328.40/117,312.60 = 64,331.60/x
  3. Step 3: Cross multiply
    78,328.40x = 117,312.60 × 64,331.60
  4. Step 4: Simplify right side
    78,328.40x = 7,546,907,258.16
  5. Step 5: Solve for x
    x = 7,546,907,258.16/78,328.40
  6. Step 6: Final answer
    x = 96,349.56

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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.