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Finding the Fourth Proportional to 387,811.65, 535,173.03 and 215,728.77

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Solution

The fourth proportional to 387,811.65, 535,173.03 and 215,728.77 is: 297,701.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,811.65 : 535,173.03 = 215,728.77 : x
  2. Step 2: Convert to fraction form
    387,811.65/535,173.03 = 215,728.77/x
  3. Step 3: Cross multiply
    387,811.65x = 535,173.03 × 215,728.77
  4. Step 4: Simplify right side
    387,811.65x = 115,452,219,499.07
  5. Step 5: Solve for x
    x = 115,452,219,499.07/387,811.65
  6. Step 6: Final answer
    x = 297,701.78

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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.