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Finding the Fourth Proportional to 390,181.89, 538,494.72 and 220,426.95

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Solution

The fourth proportional to 390,181.89, 538,494.72 and 220,426.95 is: 304,213.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,181.89 : 538,494.72 = 220,426.95 : x
  2. Step 2: Convert to fraction form
    390,181.89/538,494.72 = 220,426.95/x
  3. Step 3: Cross multiply
    390,181.89x = 538,494.72 × 220,426.95
  4. Step 4: Simplify right side
    390,181.89x = 118,698,748,720.70
  5. Step 5: Solve for x
    x = 118,698,748,720.70/390,181.89
  6. Step 6: Final answer
    x = 304,213.89

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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.