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Finding the Fourth Proportional to 860,291.80, 1,287,813.30 and 765,813.40

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Solution

The fourth proportional to 860,291.80, 1,287,813.30 and 765,813.40 is: 1,146,383.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    860,291.80 : 1,287,813.30 = 765,813.40 : x
  2. Step 2: Convert to fraction form
    860,291.80/1,287,813.30 = 765,813.40/x
  3. Step 3: Cross multiply
    860,291.80x = 1,287,813.30 × 765,813.40
  4. Step 4: Simplify right side
    860,291.80x = 986,224,681,838.22
  5. Step 5: Solve for x
    x = 986,224,681,838.22/860,291.80
  6. Step 6: Final answer
    x = 1,146,383.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.