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Finding the Fourth Proportional to 308,964.88, 426,272.40 and 172,978.80

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Solution

The fourth proportional to 308,964.88, 426,272.40 and 172,978.80 is: 238,655.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,964.88 : 426,272.40 = 172,978.80 : x
  2. Step 2: Convert to fraction form
    308,964.88/426,272.40 = 172,978.80/x
  3. Step 3: Cross multiply
    308,964.88x = 426,272.40 × 172,978.80
  4. Step 4: Simplify right side
    308,964.88x = 73,736,088,225.12
  5. Step 5: Solve for x
    x = 73,736,088,225.12/308,964.88
  6. Step 6: Final answer
    x = 238,655.24

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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.