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Finding the Fourth Proportional to 661,388.30, 912,689.25 and 389,467.65

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Solution

The fourth proportional to 661,388.30, 912,689.25 and 389,467.65 is: 537,449.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,388.30 : 912,689.25 = 389,467.65 : x
  2. Step 2: Convert to fraction form
    661,388.30/912,689.25 = 389,467.65/x
  3. Step 3: Cross multiply
    661,388.30x = 912,689.25 × 389,467.65
  4. Step 4: Simplify right side
    661,388.30x = 355,462,937,377.76
  5. Step 5: Solve for x
    x = 355,462,937,377.76/661,388.30
  6. Step 6: Final answer
    x = 537,449.69

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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.