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Finding the Fourth Proportional to 659,095.80, 988,643.70 and 647,431.80

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Solution

The fourth proportional to 659,095.80, 988,643.70 and 647,431.80 is: 971,147.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,095.80 : 988,643.70 = 647,431.80 : x
  2. Step 2: Convert to fraction form
    659,095.80/988,643.70 = 647,431.80/x
  3. Step 3: Cross multiply
    659,095.80x = 988,643.70 × 647,431.80
  4. Step 4: Simplify right side
    659,095.80x = 640,079,370,249.66
  5. Step 5: Solve for x
    x = 640,079,370,249.66/659,095.80
  6. Step 6: Final answer
    x = 971,147.70

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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.