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Finding the Fourth Proportional to 715,404.60, 987,043.05 and 428,820.12

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Solution

The fourth proportional to 715,404.60, 987,043.05 and 428,820.12 is: 591,642.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,404.60 : 987,043.05 = 428,820.12 : x
  2. Step 2: Convert to fraction form
    715,404.60/987,043.05 = 428,820.12/x
  3. Step 3: Cross multiply
    715,404.60x = 987,043.05 × 428,820.12
  4. Step 4: Simplify right side
    715,404.60x = 423,263,919,146.17
  5. Step 5: Solve for x
    x = 423,263,919,146.17/715,404.60
  6. Step 6: Final answer
    x = 591,642.71

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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.