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Finding the Fourth Proportional to 387,878.08, 535,268.40 and 218,108.56

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Solution

The fourth proportional to 387,878.08, 535,268.40 and 218,108.56 is: 300,987.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,878.08 : 535,268.40 = 218,108.56 : x
  2. Step 2: Convert to fraction form
    387,878.08/535,268.40 = 218,108.56/x
  3. Step 3: Cross multiply
    387,878.08x = 535,268.40 × 218,108.56
  4. Step 4: Simplify right side
    387,878.08x = 116,746,619,937.50
  5. Step 5: Solve for x
    x = 116,746,619,937.50/387,878.08
  6. Step 6: Final answer
    x = 300,987.93

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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.