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Finding the Fourth Proportional to 387,798.63, 535,168.79 and 215,730.33

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Solution

The fourth proportional to 387,798.63, 535,168.79 and 215,730.33 is: 297,711.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,798.63 : 535,168.79 = 215,730.33 : x
  2. Step 2: Convert to fraction form
    387,798.63/535,168.79 = 215,730.33/x
  3. Step 3: Cross multiply
    387,798.63x = 535,168.79 × 215,730.33
  4. Step 4: Simplify right side
    387,798.63x = 115,452,139,672.40
  5. Step 5: Solve for x
    x = 115,452,139,672.40/387,798.63
  6. Step 6: Final answer
    x = 297,711.57

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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.