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Finding the Fourth Proportional to 421,564.20, 632,127.60 and 155,187.60

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Solution

The fourth proportional to 421,564.20, 632,127.60 and 155,187.60 is: 232,700.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,564.20 : 632,127.60 = 155,187.60 : x
  2. Step 2: Convert to fraction form
    421,564.20/632,127.60 = 155,187.60/x
  3. Step 3: Cross multiply
    421,564.20x = 632,127.60 × 155,187.60
  4. Step 4: Simplify right side
    421,564.20x = 98,098,365,137.76
  5. Step 5: Solve for x
    x = 98,098,365,137.76/421,564.20
  6. Step 6: Final answer
    x = 232,700.89

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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.