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Finding the Fourth Proportional to 74,658,543.60, 111,987,815.40 and 20,805,855.60

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Solution

The fourth proportional to 74,658,543.60, 111,987,815.40 and 20,805,855.60 is: 31,208,783.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,658,543.60 : 111,987,815.40 = 20,805,855.60 : x
  2. Step 2: Convert to fraction form
    74,658,543.60/111,987,815.40 = 20,805,855.60/x
  3. Step 3: Cross multiply
    74,658,543.60x = 111,987,815.40 × 20,805,855.60
  4. Step 4: Simplify right side
    74,658,543.60x = 2,330,002,316,171,856.50
  5. Step 5: Solve for x
    x = 2,330,002,316,171,856.50/74,658,543.60
  6. Step 6: Final answer
    x = 31,208,783.40

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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.