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Finding the Fourth Proportional to 390,932.40, 539,544.60 and 247,705.78

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Solution

The fourth proportional to 390,932.40, 539,544.60 and 247,705.78 is: 341,870.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,932.40 : 539,544.60 = 247,705.78 : x
  2. Step 2: Convert to fraction form
    390,932.40/539,544.60 = 247,705.78/x
  3. Step 3: Cross multiply
    390,932.40x = 539,544.60 × 247,705.78
  4. Step 4: Simplify right side
    390,932.40x = 133,648,315,987.79
  5. Step 5: Solve for x
    x = 133,648,315,987.79/390,932.40
  6. Step 6: Final answer
    x = 341,870.66

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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.