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Finding the Fourth Proportional to 865,403.76, 1,200,367.38 and 842,386.80

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Solution

The fourth proportional to 865,403.76, 1,200,367.38 and 842,386.80 is: 1,168,441.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    865,403.76 : 1,200,367.38 = 842,386.80 : x
  2. Step 2: Convert to fraction form
    865,403.76/1,200,367.38 = 842,386.80/x
  3. Step 3: Cross multiply
    865,403.76x = 1,200,367.38 × 842,386.80
  4. Step 4: Simplify right side
    865,403.76x = 1,011,173,636,062.58
  5. Step 5: Solve for x
    x = 1,011,173,636,062.58/865,403.76
  6. Step 6: Final answer
    x = 1,168,441.46

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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.