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Finding the Fourth Proportional to 620,965.78, 931,420.70 and 216,443.23

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Solution

The fourth proportional to 620,965.78, 931,420.70 and 216,443.23 is: 324,655.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,965.78 : 931,420.70 = 216,443.23 : x
  2. Step 2: Convert to fraction form
    620,965.78/931,420.70 = 216,443.23/x
  3. Step 3: Cross multiply
    620,965.78x = 931,420.70 × 216,443.23
  4. Step 4: Simplify right side
    620,965.78x = 201,599,704,796.86
  5. Step 5: Solve for x
    x = 201,599,704,796.86/620,965.78
  6. Step 6: Final answer
    x = 324,655.10

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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.