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Finding the Fourth Proportional to 390,297.63, 538,611.62 and 218,221.72

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Solution

The fourth proportional to 390,297.63, 538,611.62 and 218,221.72 is: 301,146.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,297.63 : 538,611.62 = 218,221.72 : x
  2. Step 2: Convert to fraction form
    390,297.63/538,611.62 = 218,221.72/x
  3. Step 3: Cross multiply
    390,297.63x = 538,611.62 × 218,221.72
  4. Step 4: Simplify right side
    390,297.63x = 117,536,754,128.39
  5. Step 5: Solve for x
    x = 117,536,754,128.39/390,297.63
  6. Step 6: Final answer
    x = 301,146.47

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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.