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Finding the Fourth Proportional to 390,339.56, 538,643.65 and 218,271.71

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Solution

The fourth proportional to 390,339.56, 538,643.65 and 218,271.71 is: 301,201.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,339.56 : 538,643.65 = 218,271.71 : x
  2. Step 2: Convert to fraction form
    390,339.56/538,643.65 = 218,271.71/x
  3. Step 3: Cross multiply
    390,339.56x = 538,643.65 × 218,271.71
  4. Step 4: Simplify right side
    390,339.56x = 117,570,670,566.14
  5. Step 5: Solve for x
    x = 117,570,670,566.14/390,339.56
  6. Step 6: Final answer
    x = 301,201.01

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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.