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Finding the Fourth Proportional to 426,651.60, 639,762.48 and 142,241.28

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Solution

The fourth proportional to 426,651.60, 639,762.48 and 142,241.28 is: 213,290.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,651.60 : 639,762.48 = 142,241.28 : x
  2. Step 2: Convert to fraction form
    426,651.60/639,762.48 = 142,241.28/x
  3. Step 3: Cross multiply
    426,651.60x = 639,762.48 × 142,241.28
  4. Step 4: Simplify right side
    426,651.60x = 91,000,634,051.17
  5. Step 5: Solve for x
    x = 91,000,634,051.17/426,651.60
  6. Step 6: Final answer
    x = 213,290.27

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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.