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Finding the Fourth Proportional to 439,830.80, 658,968.60 and 390,064.40

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Solution

The fourth proportional to 439,830.80, 658,968.60 and 390,064.40 is: 584,406.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,830.80 : 658,968.60 = 390,064.40 : x
  2. Step 2: Convert to fraction form
    439,830.80/658,968.60 = 390,064.40/x
  3. Step 3: Cross multiply
    439,830.80x = 658,968.60 × 390,064.40
  4. Step 4: Simplify right side
    439,830.80x = 257,040,191,577.84
  5. Step 5: Solve for x
    x = 257,040,191,577.84/439,830.80
  6. Step 6: Final answer
    x = 584,406.98

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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.