Home / 390,864.39-539,387.72-221,098.52

Finding the Fourth Proportional to 390,864.39, 539,387.72 and 221,098.52

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Solution

The fourth proportional to 390,864.39, 539,387.72 and 221,098.52 is: 305,113.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,864.39 : 539,387.72 = 221,098.52 : x
  2. Step 2: Convert to fraction form
    390,864.39/539,387.72 = 221,098.52/x
  3. Step 3: Cross multiply
    390,864.39x = 539,387.72 × 221,098.52
  4. Step 4: Simplify right side
    390,864.39x = 119,257,822,795.74
  5. Step 5: Solve for x
    x = 119,257,822,795.74/390,864.39
  6. Step 6: Final answer
    x = 305,113.04

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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.