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Finding the Fourth Proportional to 708,930.69, 978,319.85 and 403,007.09

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Solution

The fourth proportional to 708,930.69, 978,319.85 and 403,007.09 is: 556,147.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,930.69 : 978,319.85 = 403,007.09 : x
  2. Step 2: Convert to fraction form
    708,930.69/978,319.85 = 403,007.09/x
  3. Step 3: Cross multiply
    708,930.69x = 978,319.85 × 403,007.09
  4. Step 4: Simplify right side
    708,930.69x = 394,269,828,931.10
  5. Step 5: Solve for x
    x = 394,269,828,931.10/708,930.69
  6. Step 6: Final answer
    x = 556,147.22

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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.