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Finding the Fourth Proportional to 620,139.78, 855,782.01 and 348,209.82

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Solution

The fourth proportional to 620,139.78, 855,782.01 and 348,209.82 is: 480,523.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,139.78 : 855,782.01 = 348,209.82 : x
  2. Step 2: Convert to fraction form
    620,139.78/855,782.01 = 348,209.82/x
  3. Step 3: Cross multiply
    620,139.78x = 855,782.01 × 348,209.82
  4. Step 4: Simplify right side
    620,139.78x = 297,991,699,661.34
  5. Step 5: Solve for x
    x = 297,991,699,661.34/620,139.78
  6. Step 6: Final answer
    x = 480,523.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.