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Finding the Fourth Proportional to 641,921.36, 885,779.96 and 355,369.68

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Solution

The fourth proportional to 641,921.36, 885,779.96 and 355,369.68 is: 490,370.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,921.36 : 885,779.96 = 355,369.68 : x
  2. Step 2: Convert to fraction form
    641,921.36/885,779.96 = 355,369.68/x
  3. Step 3: Cross multiply
    641,921.36x = 885,779.96 × 355,369.68
  4. Step 4: Simplify right side
    641,921.36x = 314,779,339,158.76
  5. Step 5: Solve for x
    x = 314,779,339,158.76/641,921.36
  6. Step 6: Final answer
    x = 490,370.57

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Double scale
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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.