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Finding the Fourth Proportional to 315,878.14, 435,910.79 and 172,638.14

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Solution

The fourth proportional to 315,878.14, 435,910.79 and 172,638.14 is: 238,240.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,878.14 : 435,910.79 = 172,638.14 : x
  2. Step 2: Convert to fraction form
    315,878.14/435,910.79 = 172,638.14/x
  3. Step 3: Cross multiply
    315,878.14x = 435,910.79 × 172,638.14
  4. Step 4: Simplify right side
    315,878.14x = 75,254,827,128.34
  5. Step 5: Solve for x
    x = 75,254,827,128.34/315,878.14
  6. Step 6: Final answer
    x = 238,240.06

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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.