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Finding the Fourth Proportional to 628,017.15, 866,645.15 and 356,109.87

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Solution

The fourth proportional to 628,017.15, 866,645.15 and 356,109.87 is: 491,421.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,017.15 : 866,645.15 = 356,109.87 : x
  2. Step 2: Convert to fraction form
    628,017.15/866,645.15 = 356,109.87/x
  3. Step 3: Cross multiply
    628,017.15x = 866,645.15 × 356,109.87
  4. Step 4: Simplify right side
    628,017.15x = 308,620,889,298.68
  5. Step 5: Solve for x
    x = 308,620,889,298.68/628,017.15
  6. Step 6: Final answer
    x = 491,421.12

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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.