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Finding the Fourth Proportional to 315,881.70, 435,910.26 and 172,642.76

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Solution

The fourth proportional to 315,881.70, 435,910.26 and 172,642.76 is: 238,243.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,881.70 : 435,910.26 = 172,642.76 : x
  2. Step 2: Convert to fraction form
    315,881.70/435,910.26 = 172,642.76/x
  3. Step 3: Cross multiply
    315,881.70x = 435,910.26 × 172,642.76
  4. Step 4: Simplify right side
    315,881.70x = 75,256,750,398.72
  5. Step 5: Solve for x
    x = 75,256,750,398.72/315,881.70
  6. Step 6: Final answer
    x = 238,243.46

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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.