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Finding the Fourth Proportional to 310,428.29, 428,426.57 and 172,620.98

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Solution

The fourth proportional to 310,428.29, 428,426.57 and 172,620.98 is: 238,236.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,428.29 : 428,426.57 = 172,620.98 : x
  2. Step 2: Convert to fraction form
    310,428.29/428,426.57 = 172,620.98/x
  3. Step 3: Cross multiply
    310,428.29x = 428,426.57 × 172,620.98
  4. Step 4: Simplify right side
    310,428.29x = 73,955,411,366.20
  5. Step 5: Solve for x
    x = 73,955,411,366.20/310,428.29
  6. Step 6: Final answer
    x = 238,236.70

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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.