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Finding the Fourth Proportional to 306,618, 423,139.32 and 172,482

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Solution

The fourth proportional to 306,618, 423,139.32 and 172,482 is: 238,028.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    306,618 : 423,139.32 = 172,482 : x
  2. Step 2: Convert to fraction form
    306,618/423,139.32 = 172,482/x
  3. Step 3: Cross multiply
    306,618x = 423,139.32 × 172,482
  4. Step 4: Simplify right side
    306,618x = 72,983,916,192.24
  5. Step 5: Solve for x
    x = 72,983,916,192.24/306,618
  6. Step 6: Final answer
    x = 238,028.81

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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.