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Finding the Fourth Proportional to 865,406.76, 1,200,371.55 and 842,389.80

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Solution

The fourth proportional to 865,406.76, 1,200,371.55 and 842,389.80 is: 1,168,445.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    865,406.76 : 1,200,371.55 = 842,389.80 : x
  2. Step 2: Convert to fraction form
    865,406.76/1,200,371.55 = 842,389.80/x
  3. Step 3: Cross multiply
    865,406.76x = 1,200,371.55 × 842,389.80
  4. Step 4: Simplify right side
    865,406.76x = 1,011,180,749,930.19
  5. Step 5: Solve for x
    x = 1,011,180,749,930.19/865,406.76
  6. Step 6: Final answer
    x = 1,168,445.63

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.