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Finding the Fourth Proportional to 663,822.40, 993,890.40 and 645,390.40

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Solution

The fourth proportional to 663,822.40, 993,890.40 and 645,390.40 is: 966,293.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,822.40 : 993,890.40 = 645,390.40 : x
  2. Step 2: Convert to fraction form
    663,822.40/993,890.40 = 645,390.40/x
  3. Step 3: Cross multiply
    663,822.40x = 993,890.40 × 645,390.40
  4. Step 4: Simplify right side
    663,822.40x = 641,447,322,812.16
  5. Step 5: Solve for x
    x = 641,447,322,812.16/663,822.40
  6. Step 6: Final answer
    x = 966,293.58

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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.