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Finding the Fourth Proportional to 646,359.48, 892,012.86 and 388,315.36

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Solution

The fourth proportional to 646,359.48, 892,012.86 and 388,315.36 is: 535,897.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    646,359.48 : 892,012.86 = 388,315.36 : x
  2. Step 2: Convert to fraction form
    646,359.48/892,012.86 = 388,315.36/x
  3. Step 3: Cross multiply
    646,359.48x = 892,012.86 × 388,315.36
  4. Step 4: Simplify right side
    646,359.48x = 346,382,294,855.53
  5. Step 5: Solve for x
    x = 346,382,294,855.53/646,359.48
  6. Step 6: Final answer
    x = 535,897.29

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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.