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Finding the Fourth Proportional to 421,410.87, 581,439.06 and 249,320.70

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Solution

The fourth proportional to 421,410.87, 581,439.06 and 249,320.70 is: 343,998.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,410.87 : 581,439.06 = 249,320.70 : x
  2. Step 2: Convert to fraction form
    421,410.87/581,439.06 = 249,320.70/x
  3. Step 3: Cross multiply
    421,410.87x = 581,439.06 × 249,320.70
  4. Step 4: Simplify right side
    421,410.87x = 144,964,793,446.54
  5. Step 5: Solve for x
    x = 144,964,793,446.54/421,410.87
  6. Step 6: Final answer
    x = 343,998.70

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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.