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Finding the Fourth Proportional to 643,573,373.60, 965,360,060.40 and 212,751,869.60

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Solution

The fourth proportional to 643,573,373.60, 965,360,060.40 and 212,751,869.60 is: 319,127,804.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,573,373.60 : 965,360,060.40 = 212,751,869.60 : x
  2. Step 2: Convert to fraction form
    643,573,373.60/965,360,060.40 = 212,751,869.60/x
  3. Step 3: Cross multiply
    643,573,373.60x = 965,360,060.40 × 212,751,869.60
  4. Step 4: Simplify right side
    643,573,373.60x = 205,382,157,687,268,928
  5. Step 5: Solve for x
    x = 205,382,157,687,268,928/643,573,373.60
  6. Step 6: Final answer
    x = 319,127,804.40

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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.