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Finding the Fourth Proportional to 315,879.70, 435,907.51 and 172,640.76

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Solution

The fourth proportional to 315,879.70, 435,907.51 and 172,640.76 is: 238,240.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,879.70 : 435,907.51 = 172,640.76 : x
  2. Step 2: Convert to fraction form
    315,879.70/435,907.51 = 172,640.76/x
  3. Step 3: Cross multiply
    315,879.70x = 435,907.51 × 172,640.76
  4. Step 4: Simplify right side
    315,879.70x = 75,255,402,952.90
  5. Step 5: Solve for x
    x = 75,255,402,952.90/315,879.70
  6. Step 6: Final answer
    x = 238,240.71

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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.