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Finding the Fourth Proportional to 85,420.40, 127,828.20 and 74,447.60

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Solution

The fourth proportional to 85,420.40, 127,828.20 and 74,447.60 is: 111,407.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,420.40 : 127,828.20 = 74,447.60 : x
  2. Step 2: Convert to fraction form
    85,420.40/127,828.20 = 74,447.60/x
  3. Step 3: Cross multiply
    85,420.40x = 127,828.20 × 74,447.60
  4. Step 4: Simplify right side
    85,420.40x = 9,516,502,702.32
  5. Step 5: Solve for x
    x = 9,516,502,702.32/85,420.40
  6. Step 6: Final answer
    x = 111,407.85

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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.