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Finding the Fourth Proportional to 390,639.54, 539,079.65 and 220,879.74

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Solution

The fourth proportional to 390,639.54, 539,079.65 and 220,879.74 is: 304,812.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,639.54 : 539,079.65 = 220,879.74 : x
  2. Step 2: Convert to fraction form
    390,639.54/539,079.65 = 220,879.74/x
  3. Step 3: Cross multiply
    390,639.54x = 539,079.65 × 220,879.74
  4. Step 4: Simplify right side
    390,639.54x = 119,071,775,919.19
  5. Step 5: Solve for x
    x = 119,071,775,919.19/390,639.54
  6. Step 6: Final answer
    x = 304,812.40

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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.