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Finding the Fourth Proportional to 641,143.80, 961,715.70 and 346,231.80

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Solution

The fourth proportional to 641,143.80, 961,715.70 and 346,231.80 is: 519,347.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,143.80 : 961,715.70 = 346,231.80 : x
  2. Step 2: Convert to fraction form
    641,143.80/961,715.70 = 346,231.80/x
  3. Step 3: Cross multiply
    641,143.80x = 961,715.70 × 346,231.80
  4. Step 4: Simplify right side
    641,143.80x = 332,976,557,899.26
  5. Step 5: Solve for x
    x = 332,976,557,899.26/641,143.80
  6. Step 6: Final answer
    x = 519,347.70

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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.