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Finding the Fourth Proportional to 390,660.96, 539,053.20 and 237,620.64

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Solution

The fourth proportional to 390,660.96, 539,053.20 and 237,620.64 is: 327,880.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,660.96 : 539,053.20 = 237,620.64 : x
  2. Step 2: Convert to fraction form
    390,660.96/539,053.20 = 237,620.64/x
  3. Step 3: Cross multiply
    390,660.96x = 539,053.20 × 237,620.64
  4. Step 4: Simplify right side
    390,660.96x = 128,090,166,378.05
  5. Step 5: Solve for x
    x = 128,090,166,378.05/390,660.96
  6. Step 6: Final answer
    x = 327,880.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.