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Finding the Fourth Proportional to 30,010,579.80, 42,128,185.80 and 30,010,579.80

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Solution

The fourth proportional to 30,010,579.80, 42,128,185.80 and 30,010,579.80 is: 42,128,185.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,010,579.80 : 42,128,185.80 = 30,010,579.80 : x
  2. Step 2: Convert to fraction form
    30,010,579.80/42,128,185.80 = 30,010,579.80/x
  3. Step 3: Cross multiply
    30,010,579.80x = 42,128,185.80 × 30,010,579.80
  4. Step 4: Simplify right side
    30,010,579.80x = 1,264,291,281,780,126.75
  5. Step 5: Solve for x
    x = 1,264,291,281,780,126.75/30,010,579.80
  6. Step 6: Final answer
    x = 42,128,185.80

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.