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Finding the Fourth Proportional to 390,335.84, 538,674 and 220,566.08

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Solution

The fourth proportional to 390,335.84, 538,674 and 220,566.08 is: 304,387.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,335.84 : 538,674 = 220,566.08 : x
  2. Step 2: Convert to fraction form
    390,335.84/538,674 = 220,566.08/x
  3. Step 3: Cross multiply
    390,335.84x = 538,674 × 220,566.08
  4. Step 4: Simplify right side
    390,335.84x = 118,813,212,577.92
  5. Step 5: Solve for x
    x = 118,813,212,577.92/390,335.84
  6. Step 6: Final answer
    x = 304,387.15

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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.