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Finding the Fourth Proportional to 620,990.64, 931,847.40 and 261,135.45

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Solution

The fourth proportional to 620,990.64, 931,847.40 and 261,135.45 is: 391,855.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,990.64 : 931,847.40 = 261,135.45 : x
  2. Step 2: Convert to fraction form
    620,990.64/931,847.40 = 261,135.45/x
  3. Step 3: Cross multiply
    620,990.64x = 931,847.40 × 261,135.45
  4. Step 4: Simplify right side
    620,990.64x = 243,338,390,130.33
  5. Step 5: Solve for x
    x = 243,338,390,130.33/620,990.64
  6. Step 6: Final answer
    x = 391,855.17

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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.