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Finding the Fourth Proportional to 390,085.68, 538,278.48 and 220,286.88

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Solution

The fourth proportional to 390,085.68, 538,278.48 and 220,286.88 is: 303,973.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,085.68 : 538,278.48 = 220,286.88 : x
  2. Step 2: Convert to fraction form
    390,085.68/538,278.48 = 220,286.88/x
  3. Step 3: Cross multiply
    390,085.68x = 538,278.48 × 220,286.88
  4. Step 4: Simplify right side
    390,085.68x = 118,575,686,930.34
  5. Step 5: Solve for x
    x = 118,575,686,930.34/390,085.68
  6. Step 6: Final answer
    x = 303,973.44

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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.