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Finding the Fourth Proportional to 811,385.60, 1,215,328.80 and 811,385.60

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Solution

The fourth proportional to 811,385.60, 1,215,328.80 and 811,385.60 is: 1,215,328.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,385.60 : 1,215,328.80 = 811,385.60 : x
  2. Step 2: Convert to fraction form
    811,385.60/1,215,328.80 = 811,385.60/x
  3. Step 3: Cross multiply
    811,385.60x = 1,215,328.80 × 811,385.60
  4. Step 4: Simplify right side
    811,385.60x = 986,100,287,585.28
  5. Step 5: Solve for x
    x = 986,100,287,585.28/811,385.60
  6. Step 6: Final answer
    x = 1,215,328.80

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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.