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Finding the Fourth Proportional to 659,139.60, 988,709.40 and 393,200.40

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Solution

The fourth proportional to 659,139.60, 988,709.40 and 393,200.40 is: 589,800.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,139.60 : 988,709.40 = 393,200.40 : x
  2. Step 2: Convert to fraction form
    659,139.60/988,709.40 = 393,200.40/x
  3. Step 3: Cross multiply
    659,139.60x = 988,709.40 × 393,200.40
  4. Step 4: Simplify right side
    659,139.60x = 388,760,931,563.76
  5. Step 5: Solve for x
    x = 388,760,931,563.76/659,139.60
  6. Step 6: Final answer
    x = 589,800.60

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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.