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Finding the Fourth Proportional to 66,424,978.40, 99,637,467.60 and 40,782,840.80

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Solution

The fourth proportional to 66,424,978.40, 99,637,467.60 and 40,782,840.80 is: 61,174,261.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,424,978.40 : 99,637,467.60 = 40,782,840.80 : x
  2. Step 2: Convert to fraction form
    66,424,978.40/99,637,467.60 = 40,782,840.80/x
  3. Step 3: Cross multiply
    66,424,978.40x = 99,637,467.60 × 40,782,840.80
  4. Step 4: Simplify right side
    66,424,978.40x = 4,063,498,978,845,957.50
  5. Step 5: Solve for x
    x = 4,063,498,978,845,957.50/66,424,978.40
  6. Step 6: Final answer
    x = 61,174,261.20

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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.