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Finding the Fourth Proportional to 390,173.89, 538,483.68 and 220,418.95

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Solution

The fourth proportional to 390,173.89, 538,483.68 and 220,418.95 is: 304,202.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,173.89 : 538,483.68 = 220,418.95 : x
  2. Step 2: Convert to fraction form
    390,173.89/538,483.68 = 220,418.95/x
  3. Step 3: Cross multiply
    390,173.89x = 538,483.68 × 220,418.95
  4. Step 4: Simplify right side
    390,173.89x = 118,692,007,337.74
  5. Step 5: Solve for x
    x = 118,692,007,337.74/390,173.89
  6. Step 6: Final answer
    x = 304,202.84

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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.