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Finding the Fourth Proportional to 390,924.16, 539,002.56 and 330,388

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Solution

The fourth proportional to 390,924.16, 539,002.56 and 330,388 is: 455,535.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,924.16 : 539,002.56 = 330,388 : x
  2. Step 2: Convert to fraction form
    390,924.16/539,002.56 = 330,388/x
  3. Step 3: Cross multiply
    390,924.16x = 539,002.56 × 330,388
  4. Step 4: Simplify right side
    390,924.16x = 178,079,977,793.28
  5. Step 5: Solve for x
    x = 178,079,977,793.28/390,924.16
  6. Step 6: Final answer
    x = 455,535.87

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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.