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Finding the Fourth Proportional to 390,655.89, 539,126.10 and 218,563.58

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Solution

The fourth proportional to 390,655.89, 539,126.10 and 218,563.58 is: 301,629.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,655.89 : 539,126.10 = 218,563.58 : x
  2. Step 2: Convert to fraction form
    390,655.89/539,126.10 = 218,563.58/x
  3. Step 3: Cross multiply
    390,655.89x = 539,126.10 × 218,563.58
  4. Step 4: Simplify right side
    390,655.89x = 117,833,331,835.25
  5. Step 5: Solve for x
    x = 117,833,331,835.25/390,655.89
  6. Step 6: Final answer
    x = 301,629.48

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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.