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Finding the Fourth Proportional to 66,489,062.40, 99,742,924.80 and 21,046,118.40

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Solution

The fourth proportional to 66,489,062.40, 99,742,924.80 and 21,046,118.40 is: 31,572,131.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,489,062.40 : 99,742,924.80 = 21,046,118.40 : x
  2. Step 2: Convert to fraction form
    66,489,062.40/99,742,924.80 = 21,046,118.40/x
  3. Step 3: Cross multiply
    66,489,062.40x = 99,742,924.80 × 21,046,118.40
  4. Step 4: Simplify right side
    66,489,062.40x = 2,099,201,404,903,096
  5. Step 5: Solve for x
    x = 2,099,201,404,903,096/66,489,062.40
  6. Step 6: Final answer
    x = 31,572,131.25

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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.