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Finding the Fourth Proportional to 391,320.94, 589,646.88 and 321,800.76

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Solution

The fourth proportional to 391,320.94, 589,646.88 and 321,800.76 is: 484,893.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,320.94 : 589,646.88 = 321,800.76 : x
  2. Step 2: Convert to fraction form
    391,320.94/589,646.88 = 321,800.76/x
  3. Step 3: Cross multiply
    391,320.94x = 589,646.88 × 321,800.76
  4. Step 4: Simplify right side
    391,320.94x = 189,748,814,115.63
  5. Step 5: Solve for x
    x = 189,748,814,115.63/391,320.94
  6. Step 6: Final answer
    x = 484,893.08

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.