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Finding the Fourth Proportional to 811,660.80, 1,211,625.60 and 712,128

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Solution

The fourth proportional to 811,660.80, 1,211,625.60 and 712,128 is: 1,063,045.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,660.80 : 1,211,625.60 = 712,128 : x
  2. Step 2: Convert to fraction form
    811,660.80/1,211,625.60 = 712,128/x
  3. Step 3: Cross multiply
    811,660.80x = 1,211,625.60 × 712,128
  4. Step 4: Simplify right side
    811,660.80x = 862,832,515,276.80
  5. Step 5: Solve for x
    x = 862,832,515,276.80/811,660.80
  6. Step 6: Final answer
    x = 1,063,045.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.