Home / 390,336.31-538,657.10-220,566.79

Finding the Fourth Proportional to 390,336.31, 538,657.10 and 220,566.79

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Solution

The fourth proportional to 390,336.31, 538,657.10 and 220,566.79 is: 304,378.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,336.31 : 538,657.10 = 220,566.79 : x
  2. Step 2: Convert to fraction form
    390,336.31/538,657.10 = 220,566.79/x
  3. Step 3: Cross multiply
    390,336.31x = 538,657.10 × 220,566.79
  4. Step 4: Simplify right side
    390,336.31x = 118,809,867,457.71
  5. Step 5: Solve for x
    x = 118,809,867,457.71/390,336.31
  6. Step 6: Final answer
    x = 304,378.21

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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.