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Finding the Fourth Proportional to 74,902,679.60, 112,354,019.40 and 21,049,991.60

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Solution

The fourth proportional to 74,902,679.60, 112,354,019.40 and 21,049,991.60 is: 31,574,987.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,902,679.60 : 112,354,019.40 = 21,049,991.60 : x
  2. Step 2: Convert to fraction form
    74,902,679.60/112,354,019.40 = 21,049,991.60/x
  3. Step 3: Cross multiply
    74,902,679.60x = 112,354,019.40 × 21,049,991.60
  4. Step 4: Simplify right side
    74,902,679.60x = 2,365,051,164,596,237.50
  5. Step 5: Solve for x
    x = 2,365,051,164,596,237.50/74,902,679.60
  6. Step 6: Final answer
    x = 31,574,987.40

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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.