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Finding the Fourth Proportional to 439,813.80, 658,943.10 and 390,047.40

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Solution

The fourth proportional to 439,813.80, 658,943.10 and 390,047.40 is: 584,381.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,813.80 : 658,943.10 = 390,047.40 : x
  2. Step 2: Convert to fraction form
    439,813.80/658,943.10 = 390,047.40/x
  3. Step 3: Cross multiply
    439,813.80x = 658,943.10 × 390,047.40
  4. Step 4: Simplify right side
    439,813.80x = 257,019,042,902.94
  5. Step 5: Solve for x
    x = 257,019,042,902.94/439,813.80
  6. Step 6: Final answer
    x = 584,381.49

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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.