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Finding the Fourth Proportional to 620,434.80, 869,789.70 and 620,434.80

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Solution

The fourth proportional to 620,434.80, 869,789.70 and 620,434.80 is: 869,789.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,434.80 : 869,789.70 = 620,434.80 : x
  2. Step 2: Convert to fraction form
    620,434.80/869,789.70 = 620,434.80/x
  3. Step 3: Cross multiply
    620,434.80x = 869,789.70 × 620,434.80
  4. Step 4: Simplify right side
    620,434.80x = 539,647,798,561.56
  5. Step 5: Solve for x
    x = 539,647,798,561.56/620,434.80
  6. Step 6: Final answer
    x = 869,789.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.