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Finding the Fourth Proportional to 315,370.06, 435,207.56 and 172,128.86

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Solution

The fourth proportional to 315,370.06, 435,207.56 and 172,128.86 is: 237,536.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,370.06 : 435,207.56 = 172,128.86 : x
  2. Step 2: Convert to fraction form
    315,370.06/435,207.56 = 172,128.86/x
  3. Step 3: Cross multiply
    315,370.06x = 435,207.56 × 172,128.86
  4. Step 4: Simplify right side
    315,370.06x = 74,911,781,166.18
  5. Step 5: Solve for x
    x = 74,911,781,166.18/315,370.06
  6. Step 6: Final answer
    x = 237,536.12

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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.