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Finding the Fourth Proportional to 72,809,437.64, 100,476,360.06 and 39,769,681.48

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Solution

The fourth proportional to 72,809,437.64, 100,476,360.06 and 39,769,681.48 is: 54,881,797.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,809,437.64 : 100,476,360.06 = 39,769,681.48 : x
  2. Step 2: Convert to fraction form
    72,809,437.64/100,476,360.06 = 39,769,681.48/x
  3. Step 3: Cross multiply
    72,809,437.64x = 100,476,360.06 × 39,769,681.48
  4. Step 4: Simplify right side
    72,809,437.64x = 3,995,912,835,855,993.50
  5. Step 5: Solve for x
    x = 3,995,912,835,855,993.50/72,809,437.64
  6. Step 6: Final answer
    x = 54,881,797.82

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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.