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Finding the Fourth Proportional to 665,938.60, 998,980.80 and 644,943.40

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Solution

The fourth proportional to 665,938.60, 998,980.80 and 644,943.40 is: 967,485.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,938.60 : 998,980.80 = 644,943.40 : x
  2. Step 2: Convert to fraction form
    665,938.60/998,980.80 = 644,943.40/x
  3. Step 3: Cross multiply
    665,938.60x = 998,980.80 × 644,943.40
  4. Step 4: Simplify right side
    665,938.60x = 644,286,073,686.72
  5. Step 5: Solve for x
    x = 644,286,073,686.72/665,938.60
  6. Step 6: Final answer
    x = 967,485.70

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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.