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Finding the Fourth Proportional to 643,814.60, 965,721.90 and 312,038.60

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Solution

The fourth proportional to 643,814.60, 965,721.90 and 312,038.60 is: 468,057.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,814.60 : 965,721.90 = 312,038.60 : x
  2. Step 2: Convert to fraction form
    643,814.60/965,721.90 = 312,038.60/x
  3. Step 3: Cross multiply
    643,814.60x = 965,721.90 × 312,038.60
  4. Step 4: Simplify right side
    643,814.60x = 301,342,509,665.34
  5. Step 5: Solve for x
    x = 301,342,509,665.34/643,814.60
  6. Step 6: Final answer
    x = 468,057.90

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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.