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Finding the Fourth Proportional to 390,172.88, 538,482.33 and 220,417.94

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Solution

The fourth proportional to 390,172.88, 538,482.33 and 220,417.94 is: 304,201.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,172.88 : 538,482.33 = 220,417.94 : x
  2. Step 2: Convert to fraction form
    390,172.88/538,482.33 = 220,417.94/x
  3. Step 3: Cross multiply
    390,172.88x = 538,482.33 × 220,417.94
  4. Step 4: Simplify right side
    390,172.88x = 118,691,163,212.59
  5. Step 5: Solve for x
    x = 118,691,163,212.59/390,172.88
  6. Step 6: Final answer
    x = 304,201.47

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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.