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Finding the Fourth Proportional to 306,645.80, 423,170.56 and 172,509.80

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Solution

The fourth proportional to 306,645.80, 423,170.56 and 172,509.80 is: 238,063.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    306,645.80 : 423,170.56 = 172,509.80 : x
  2. Step 2: Convert to fraction form
    306,645.80/423,170.56 = 172,509.80/x
  3. Step 3: Cross multiply
    306,645.80x = 423,170.56 × 172,509.80
  4. Step 4: Simplify right side
    306,645.80x = 73,001,068,671.49
  5. Step 5: Solve for x
    x = 73,001,068,671.49/306,645.80
  6. Step 6: Final answer
    x = 238,063.16

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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.