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Finding the Fourth Proportional to 689,814.55, 951,129.84 and 472,128.22

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Solution

The fourth proportional to 689,814.55, 951,129.84 and 472,128.22 is: 650,979.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    689,814.55 : 951,129.84 = 472,128.22 : x
  2. Step 2: Convert to fraction form
    689,814.55/951,129.84 = 472,128.22/x
  3. Step 3: Cross multiply
    689,814.55x = 951,129.84 × 472,128.22
  4. Step 4: Simplify right side
    689,814.55x = 449,055,238,348.09
  5. Step 5: Solve for x
    x = 449,055,238,348.09/689,814.55
  6. Step 6: Final answer
    x = 650,979.66

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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.