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Finding the Fourth Proportional to 439,838.80, 658,980.60 and 390,072.40

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Solution

The fourth proportional to 439,838.80, 658,980.60 and 390,072.40 is: 584,418.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,838.80 : 658,980.60 = 390,072.40 : x
  2. Step 2: Convert to fraction form
    439,838.80/658,980.60 = 390,072.40/x
  3. Step 3: Cross multiply
    439,838.80x = 658,980.60 × 390,072.40
  4. Step 4: Simplify right side
    439,838.80x = 257,050,144,195.44
  5. Step 5: Solve for x
    x = 257,050,144,195.44/439,838.80
  6. Step 6: Final answer
    x = 584,418.98

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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.