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Finding the Fourth Proportional to 390,303.56, 538,611.89 and 220,534.04

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Solution

The fourth proportional to 390,303.56, 538,611.89 and 220,534.04 is: 304,333.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,303.56 : 538,611.89 = 220,534.04 : x
  2. Step 2: Convert to fraction form
    390,303.56/538,611.89 = 220,534.04/x
  3. Step 3: Cross multiply
    390,303.56x = 538,611.89 × 220,534.04
  4. Step 4: Simplify right side
    390,303.56x = 118,782,252,298.01
  5. Step 5: Solve for x
    x = 118,782,252,298.01/390,303.56
  6. Step 6: Final answer
    x = 304,333.00

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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.