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Finding the Fourth Proportional to 306,618.80, 423,133.28 and 172,482.80

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Solution

The fourth proportional to 306,618.80, 423,133.28 and 172,482.80 is: 238,025.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    306,618.80 : 423,133.28 = 172,482.80 : x
  2. Step 2: Convert to fraction form
    306,618.80/423,133.28 = 172,482.80/x
  3. Step 3: Cross multiply
    306,618.80x = 423,133.28 × 172,482.80
  4. Step 4: Simplify right side
    306,618.80x = 72,983,212,907.58
  5. Step 5: Solve for x
    x = 72,983,212,907.58/306,618.80
  6. Step 6: Final answer
    x = 238,025.89

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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.