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Finding the Fourth Proportional to 715,790.49, 987,809.82 and 389,125.53

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Solution

The fourth proportional to 715,790.49, 987,809.82 and 389,125.53 is: 537,003.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,790.49 : 987,809.82 = 389,125.53 : x
  2. Step 2: Convert to fraction form
    715,790.49/987,809.82 = 389,125.53/x
  3. Step 3: Cross multiply
    715,790.49x = 987,809.82 × 389,125.53
  4. Step 4: Simplify right side
    715,790.49x = 384,382,019,746.71
  5. Step 5: Solve for x
    x = 384,382,019,746.71/715,790.49
  6. Step 6: Final answer
    x = 537,003.53

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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.