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Finding the Fourth Proportional to 399,599.30, 550,324.41 and 390,890.18

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Solution

The fourth proportional to 399,599.30, 550,324.41 and 390,890.18 is: 538,330.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,599.30 : 550,324.41 = 390,890.18 : x
  2. Step 2: Convert to fraction form
    399,599.30/550,324.41 = 390,890.18/x
  3. Step 3: Cross multiply
    399,599.30x = 550,324.41 × 390,890.18
  4. Step 4: Simplify right side
    399,599.30x = 215,116,407,683.29
  5. Step 5: Solve for x
    x = 215,116,407,683.29/399,599.30
  6. Step 6: Final answer
    x = 538,330.29

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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.