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Finding the Fourth Proportional to 390,774.75, 539,269.16 and 221,005.23

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Solution

The fourth proportional to 390,774.75, 539,269.16 and 221,005.23 is: 304,987.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,774.75 : 539,269.16 = 221,005.23 : x
  2. Step 2: Convert to fraction form
    390,774.75/539,269.16 = 221,005.23/x
  3. Step 3: Cross multiply
    390,774.75x = 539,269.16 × 221,005.23
  4. Step 4: Simplify right side
    390,774.75x = 119,181,303,632.68
  5. Step 5: Solve for x
    x = 119,181,303,632.68/390,774.75
  6. Step 6: Final answer
    x = 304,987.22

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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.