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Finding the Fourth Proportional to 390,818.60, 586,112.70 and 154,082.60

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Solution

The fourth proportional to 390,818.60, 586,112.70 and 154,082.60 is: 231,078.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,818.60 : 586,112.70 = 154,082.60 : x
  2. Step 2: Convert to fraction form
    390,818.60/586,112.70 = 154,082.60/x
  3. Step 3: Cross multiply
    390,818.60x = 586,112.70 × 154,082.60
  4. Step 4: Simplify right side
    390,818.60x = 90,309,768,709.02
  5. Step 5: Solve for x
    x = 90,309,768,709.02/390,818.60
  6. Step 6: Final answer
    x = 231,078.48

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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.