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Finding the Fourth Proportional to 390,391.56, 585,645.60 and 124,160.76

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Solution

The fourth proportional to 390,391.56, 585,645.60 and 124,160.76 is: 186,259.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,391.56 : 585,645.60 = 124,160.76 : x
  2. Step 2: Convert to fraction form
    390,391.56/585,645.60 = 124,160.76/x
  3. Step 3: Cross multiply
    390,391.56x = 585,645.60 × 124,160.76
  4. Step 4: Simplify right side
    390,391.56x = 72,714,202,786.66
  5. Step 5: Solve for x
    x = 72,714,202,786.66/390,391.56
  6. Step 6: Final answer
    x = 186,259.67

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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.