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Finding the Fourth Proportional to 42,920.65, 64,374.09 and 11,748.61

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Solution

The fourth proportional to 42,920.65, 64,374.09 and 11,748.61 is: 17,621.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,920.65 : 64,374.09 = 11,748.61 : x
  2. Step 2: Convert to fraction form
    42,920.65/64,374.09 = 11,748.61/x
  3. Step 3: Cross multiply
    42,920.65x = 64,374.09 × 11,748.61
  4. Step 4: Simplify right side
    42,920.65x = 756,306,077.51
  5. Step 5: Solve for x
    x = 756,306,077.51/42,920.65
  6. Step 6: Final answer
    x = 17,621.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.