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Finding the Fourth Proportional to 709,681.26, 979,326 and 403,728.87

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Solution

The fourth proportional to 709,681.26, 979,326 and 403,728.87 is: 557,126.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,681.26 : 979,326 = 403,728.87 : x
  2. Step 2: Convert to fraction form
    709,681.26/979,326 = 403,728.87/x
  3. Step 3: Cross multiply
    709,681.26x = 979,326 × 403,728.87
  4. Step 4: Simplify right side
    709,681.26x = 395,382,179,341.62
  5. Step 5: Solve for x
    x = 395,382,179,341.62/709,681.26
  6. Step 6: Final answer
    x = 557,126.42

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1.5x scale

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.