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Finding the Fourth Proportional to 681,003.12, 939,702.03 and 390,599.64

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Solution

The fourth proportional to 681,003.12, 939,702.03 and 390,599.64 is: 538,980.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,003.12 : 939,702.03 = 390,599.64 : x
  2. Step 2: Convert to fraction form
    681,003.12/939,702.03 = 390,599.64/x
  3. Step 3: Cross multiply
    681,003.12x = 939,702.03 × 390,599.64
  4. Step 4: Simplify right side
    681,003.12x = 367,047,273,160.52
  5. Step 5: Solve for x
    x = 367,047,273,160.52/681,003.12
  6. Step 6: Final answer
    x = 538,980.31

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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.