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Finding the Fourth Proportional to 388,403.32, 535,995.18 and 218,637.88

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Solution

The fourth proportional to 388,403.32, 535,995.18 and 218,637.88 is: 301,719.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,403.32 : 535,995.18 = 218,637.88 : x
  2. Step 2: Convert to fraction form
    388,403.32/535,995.18 = 218,637.88/x
  3. Step 3: Cross multiply
    388,403.32x = 535,995.18 × 218,637.88
  4. Step 4: Simplify right side
    388,403.32x = 117,188,849,845.42
  5. Step 5: Solve for x
    x = 117,188,849,845.42/388,403.32
  6. Step 6: Final answer
    x = 301,719.49

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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.