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Finding the Fourth Proportional to 30,854.90, 42,578.90 and 18,279.65

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Solution

The fourth proportional to 30,854.90, 42,578.90 and 18,279.65 is: 25,225.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,854.90 : 42,578.90 = 18,279.65 : x
  2. Step 2: Convert to fraction form
    30,854.90/42,578.90 = 18,279.65/x
  3. Step 3: Cross multiply
    30,854.90x = 42,578.90 × 18,279.65
  4. Step 4: Simplify right side
    30,854.90x = 778,327,541.53
  5. Step 5: Solve for x
    x = 778,327,541.53/30,854.90
  6. Step 6: Final answer
    x = 25,225.41

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1.5x scale

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.