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Finding the Fourth Proportional to 401,679.30, 601,352.55 and 390,015.30

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Solution

The fourth proportional to 401,679.30, 601,352.55 and 390,015.30 is: 583,890.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    401,679.30 : 601,352.55 = 390,015.30 : x
  2. Step 2: Convert to fraction form
    401,679.30/601,352.55 = 390,015.30/x
  3. Step 3: Cross multiply
    401,679.30x = 601,352.55 × 390,015.30
  4. Step 4: Simplify right side
    401,679.30x = 234,536,695,194.02
  5. Step 5: Solve for x
    x = 234,536,695,194.02/401,679.30
  6. Step 6: Final answer
    x = 583,890.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.