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Finding the Fourth Proportional to 661,685.60, 992,042.40 and 262,128.80

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Solution

The fourth proportional to 661,685.60, 992,042.40 and 262,128.80 is: 393,000.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,685.60 : 992,042.40 = 262,128.80 : x
  2. Step 2: Convert to fraction form
    661,685.60/992,042.40 = 262,128.80/x
  3. Step 3: Cross multiply
    661,685.60x = 992,042.40 × 262,128.80
  4. Step 4: Simplify right side
    661,685.60x = 260,042,883,861.12
  5. Step 5: Solve for x
    x = 260,042,883,861.12/661,685.60
  6. Step 6: Final answer
    x = 393,000.67

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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.