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Finding the Fourth Proportional to 139,820.40, 209,692.80 and 60,915.60

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Solution

The fourth proportional to 139,820.40, 209,692.80 and 60,915.60 is: 91,356.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,820.40 : 209,692.80 = 60,915.60 : x
  2. Step 2: Convert to fraction form
    139,820.40/209,692.80 = 60,915.60/x
  3. Step 3: Cross multiply
    139,820.40x = 209,692.80 × 60,915.60
  4. Step 4: Simplify right side
    139,820.40x = 12,773,562,727.68
  5. Step 5: Solve for x
    x = 12,773,562,727.68/139,820.40
  6. Step 6: Final answer
    x = 91,356.93

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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.