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Finding the Fourth Proportional to 455,307.64, 628,377.69 and 378,691.56

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Solution

The fourth proportional to 455,307.64, 628,377.69 and 378,691.56 is: 522,638.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,307.64 : 628,377.69 = 378,691.56 : x
  2. Step 2: Convert to fraction form
    455,307.64/628,377.69 = 378,691.56/x
  3. Step 3: Cross multiply
    455,307.64x = 628,377.69 × 378,691.56
  4. Step 4: Simplify right side
    455,307.64x = 237,961,327,695.30
  5. Step 5: Solve for x
    x = 237,961,327,695.30/455,307.64
  6. Step 6: Final answer
    x = 522,638.56

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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.