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Finding the Fourth Proportional to 659,840.80, 989,761.20 and 659,840.80

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Solution

The fourth proportional to 659,840.80, 989,761.20 and 659,840.80 is: 989,761.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,840.80 : 989,761.20 = 659,840.80 : x
  2. Step 2: Convert to fraction form
    659,840.80/989,761.20 = 659,840.80/x
  3. Step 3: Cross multiply
    659,840.80x = 989,761.20 × 659,840.80
  4. Step 4: Simplify right side
    659,840.80x = 653,084,822,016.96
  5. Step 5: Solve for x
    x = 653,084,822,016.96/659,840.80
  6. Step 6: Final answer
    x = 989,761.20

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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.