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Finding the Fourth Proportional to 511,990.20, 767,985.30 and 511,990.20

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Solution

The fourth proportional to 511,990.20, 767,985.30 and 511,990.20 is: 767,985.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    511,990.20 : 767,985.30 = 511,990.20 : x
  2. Step 2: Convert to fraction form
    511,990.20/767,985.30 = 511,990.20/x
  3. Step 3: Cross multiply
    511,990.20x = 767,985.30 × 511,990.20
  4. Step 4: Simplify right side
    511,990.20x = 393,200,947,344.06
  5. Step 5: Solve for x
    x = 393,200,947,344.06/511,990.20
  6. Step 6: Final answer
    x = 767,985.30

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Double scale
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Similar ratio
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1.5x scale

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.