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Finding the Fourth Proportional to 136,845,978.12, 188,696,075.58 and 87,207,668.28

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Solution

The fourth proportional to 136,845,978.12, 188,696,075.58 and 87,207,668.28 is: 120,250,116.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,845,978.12 : 188,696,075.58 = 87,207,668.28 : x
  2. Step 2: Convert to fraction form
    136,845,978.12/188,696,075.58 = 87,207,668.28/x
  3. Step 3: Cross multiply
    136,845,978.12x = 188,696,075.58 × 87,207,668.28
  4. Step 4: Simplify right side
    136,845,978.12x = 16,455,744,764,918,450
  5. Step 5: Solve for x
    x = 16,455,744,764,918,450/136,845,978.12
  6. Step 6: Final answer
    x = 120,250,116.16

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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.