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Finding the Fourth Proportional to 390,558.71, 538,945.58 and 218,446.85

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Solution

The fourth proportional to 390,558.71, 538,945.58 and 218,446.85 is: 301,442.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,558.71 : 538,945.58 = 218,446.85 : x
  2. Step 2: Convert to fraction form
    390,558.71/538,945.58 = 218,446.85/x
  3. Step 3: Cross multiply
    390,558.71x = 538,945.58 × 218,446.85
  4. Step 4: Simplify right side
    390,558.71x = 117,730,966,165.90
  5. Step 5: Solve for x
    x = 117,730,966,165.90/390,558.71
  6. Step 6: Final answer
    x = 301,442.43

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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.