Home / 715,386.51-987,233.10-393,117.36

Finding the Fourth Proportional to 715,386.51, 987,233.10 and 393,117.36

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Solution

The fourth proportional to 715,386.51, 987,233.10 and 393,117.36 is: 542,501.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,386.51 : 987,233.10 = 393,117.36 : x
  2. Step 2: Convert to fraction form
    715,386.51/987,233.10 = 393,117.36/x
  3. Step 3: Cross multiply
    715,386.51x = 987,233.10 × 393,117.36
  4. Step 4: Simplify right side
    715,386.51x = 388,098,469,976.62
  5. Step 5: Solve for x
    x = 388,098,469,976.62/715,386.51
  6. Step 6: Final answer
    x = 542,501.80

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Double scale
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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.