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Finding the Fourth Proportional to 315,678.45, 435,646.73 and 172,451.85

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Solution

The fourth proportional to 315,678.45, 435,646.73 and 172,451.85 is: 237,989.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,678.45 : 435,646.73 = 172,451.85 : x
  2. Step 2: Convert to fraction form
    315,678.45/435,646.73 = 172,451.85/x
  3. Step 3: Cross multiply
    315,678.45x = 435,646.73 × 172,451.85
  4. Step 4: Simplify right side
    315,678.45x = 75,128,083,672.69
  5. Step 5: Solve for x
    x = 75,128,083,672.69/315,678.45
  6. Step 6: Final answer
    x = 237,989.27

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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.