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Finding the Fourth Proportional to 390,636, 539,062.74 and 220,873.68

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Solution

The fourth proportional to 390,636, 539,062.74 and 220,873.68 is: 304,797.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,636 : 539,062.74 = 220,873.68 : x
  2. Step 2: Convert to fraction form
    390,636/539,062.74 = 220,873.68/x
  3. Step 3: Cross multiply
    390,636x = 539,062.74 × 220,873.68
  4. Step 4: Simplify right side
    390,636x = 119,064,771,134.68
  5. Step 5: Solve for x
    x = 119,064,771,134.68/390,636
  6. Step 6: Final answer
    x = 304,797.23

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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.