Home / 715,721.37-987,707.75-393,445.05

Finding the Fourth Proportional to 715,721.37, 987,707.75 and 393,445.05

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Solution

The fourth proportional to 715,721.37, 987,707.75 and 393,445.05 is: 542,960.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,721.37 : 987,707.75 = 393,445.05 : x
  2. Step 2: Convert to fraction form
    715,721.37/987,707.75 = 393,445.05/x
  3. Step 3: Cross multiply
    715,721.37x = 987,707.75 × 393,445.05
  4. Step 4: Simplify right side
    715,721.37x = 388,608,725,084.14
  5. Step 5: Solve for x
    x = 388,608,725,084.14/715,721.37
  6. Step 6: Final answer
    x = 542,960.91

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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.