Home / 878,500,310.45-1,211,227,365.47-643,142,365.20

Finding the Fourth Proportional to 878,500,310.45, 1,211,227,365.47 and 643,142,365.20

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Solution

The fourth proportional to 878,500,310.45, 1,211,227,365.47 and 643,142,365.20 is: 886,728,921.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    878,500,310.45 : 1,211,227,365.47 = 643,142,365.20 : x
  2. Step 2: Convert to fraction form
    878,500,310.45/1,211,227,365.47 = 643,142,365.20/x
  3. Step 3: Cross multiply
    878,500,310.45x = 1,211,227,365.47 × 643,142,365.20
  4. Step 4: Simplify right side
    878,500,310.45x = 778,991,632,620,124,928
  5. Step 5: Solve for x
    x = 778,991,632,620,124,928/878,500,310.45
  6. Step 6: Final answer
    x = 886,728,921.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.