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Finding the Fourth Proportional to 390,308.68, 538,618.98 and 220,539.16

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Solution

The fourth proportional to 390,308.68, 538,618.98 and 220,539.16 is: 304,340.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,308.68 : 538,618.98 = 220,539.16 : x
  2. Step 2: Convert to fraction form
    390,308.68/538,618.98 = 220,539.16/x
  3. Step 3: Cross multiply
    390,308.68x = 538,618.98 × 220,539.16
  4. Step 4: Simplify right side
    390,308.68x = 118,786,577,409.26
  5. Step 5: Solve for x
    x = 118,786,577,409.26/390,308.68
  6. Step 6: Final answer
    x = 304,340.09

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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.