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Finding the Fourth Proportional to 387,920.53, 535,336.86 and 215,852.23

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Solution

The fourth proportional to 387,920.53, 535,336.86 and 215,852.23 is: 297,879.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,920.53 : 535,336.86 = 215,852.23 : x
  2. Step 2: Convert to fraction form
    387,920.53/535,336.86 = 215,852.23/x
  3. Step 3: Cross multiply
    387,920.53x = 535,336.86 × 215,852.23
  4. Step 4: Simplify right side
    387,920.53x = 115,553,655,032.20
  5. Step 5: Solve for x
    x = 115,553,655,032.20/387,920.53
  6. Step 6: Final answer
    x = 297,879.71

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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.