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Finding the Fourth Proportional to 388,400.32, 535,991.04 and 218,634.88

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Solution

The fourth proportional to 388,400.32, 535,991.04 and 218,634.88 is: 301,715.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,400.32 : 535,991.04 = 218,634.88 : x
  2. Step 2: Convert to fraction form
    388,400.32/535,991.04 = 218,634.88/x
  3. Step 3: Cross multiply
    388,400.32x = 535,991.04 × 218,634.88
  4. Step 4: Simplify right side
    388,400.32x = 117,186,336,711.48
  5. Step 5: Solve for x
    x = 117,186,336,711.48/388,400.32
  6. Step 6: Final answer
    x = 301,715.35

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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.