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Finding the Fourth Proportional to 74,888.65, 103,342.45 and 40,890.57

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Solution

The fourth proportional to 74,888.65, 103,342.45 and 40,890.57 is: 56,426.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,888.65 : 103,342.45 = 40,890.57 : x
  2. Step 2: Convert to fraction form
    74,888.65/103,342.45 = 40,890.57/x
  3. Step 3: Cross multiply
    74,888.65x = 103,342.45 × 40,890.57
  4. Step 4: Simplify right side
    74,888.65x = 4,225,731,853.91
  5. Step 5: Solve for x
    x = 4,225,731,853.91/74,888.65
  6. Step 6: Final answer
    x = 56,426.87

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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.