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Finding the Fourth Proportional to 490,870.61, 677,068.43 and 318,480.58

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Solution

The fourth proportional to 490,870.61, 677,068.43 and 318,480.58 is: 439,287.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    490,870.61 : 677,068.43 = 318,480.58 : x
  2. Step 2: Convert to fraction form
    490,870.61/677,068.43 = 318,480.58/x
  3. Step 3: Cross multiply
    490,870.61x = 677,068.43 × 318,480.58
  4. Step 4: Simplify right side
    490,870.61x = 215,633,148,340.00
  5. Step 5: Solve for x
    x = 215,633,148,340.00/490,870.61
  6. Step 6: Final answer
    x = 439,287.15

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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.