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Finding the Fourth Proportional to 709,513.98, 978,691.44 and 505,630.23

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Solution

The fourth proportional to 709,513.98, 978,691.44 and 505,630.23 is: 697,457.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,513.98 : 978,691.44 = 505,630.23 : x
  2. Step 2: Convert to fraction form
    709,513.98/978,691.44 = 505,630.23/x
  3. Step 3: Cross multiply
    709,513.98x = 978,691.44 × 505,630.23
  4. Step 4: Simplify right side
    709,513.98x = 494,855,977,906.23
  5. Step 5: Solve for x
    x = 494,855,977,906.23/709,513.98
  6. Step 6: Final answer
    x = 697,457.68

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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.