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Finding the Fourth Proportional to 173,920.40, 260,880.60 and 85,128.20

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Solution

The fourth proportional to 173,920.40, 260,880.60 and 85,128.20 is: 127,692.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    173,920.40 : 260,880.60 = 85,128.20 : x
  2. Step 2: Convert to fraction form
    173,920.40/260,880.60 = 85,128.20/x
  3. Step 3: Cross multiply
    173,920.40x = 260,880.60 × 85,128.20
  4. Step 4: Simplify right side
    173,920.40x = 22,208,295,892.92
  5. Step 5: Solve for x
    x = 22,208,295,892.92/173,920.40
  6. Step 6: Final answer
    x = 127,692.30

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1.5x scale

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.