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Finding the Fourth Proportional to 679,140, 1,017,158.76 and 324,405

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Solution

The fourth proportional to 679,140, 1,017,158.76 and 324,405 is: 485,866.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,140 : 1,017,158.76 = 324,405 : x
  2. Step 2: Convert to fraction form
    679,140/1,017,158.76 = 324,405/x
  3. Step 3: Cross multiply
    679,140x = 1,017,158.76 × 324,405
  4. Step 4: Simplify right side
    679,140x = 329,971,387,537.80
  5. Step 5: Solve for x
    x = 329,971,387,537.80/679,140
  6. Step 6: Final answer
    x = 485,866.52

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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.