Home / 1,319,105.60-1,978,003.20-420,430.40

Finding the Fourth Proportional to 1,319,105.60, 1,978,003.20 and 420,430.40

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Solution

The fourth proportional to 1,319,105.60, 1,978,003.20 and 420,430.40 is: 630,436.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319,105.60 : 1,978,003.20 = 420,430.40 : x
  2. Step 2: Convert to fraction form
    1,319,105.60/1,978,003.20 = 420,430.40/x
  3. Step 3: Cross multiply
    1,319,105.60x = 1,978,003.20 × 420,430.40
  4. Step 4: Simplify right side
    1,319,105.60x = 831,612,676,577.28
  5. Step 5: Solve for x
    x = 831,612,676,577.28/1,319,105.60
  6. Step 6: Final answer
    x = 630,436.77

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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.