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Finding the Fourth Proportional to 52,578.90, 78,839.55 and 21,378.90

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Solution

The fourth proportional to 52,578.90, 78,839.55 and 21,378.90 is: 32,056.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    52,578.90 : 78,839.55 = 21,378.90 : x
  2. Step 2: Convert to fraction form
    52,578.90/78,839.55 = 21,378.90/x
  3. Step 3: Cross multiply
    52,578.90x = 78,839.55 × 21,378.90
  4. Step 4: Simplify right side
    52,578.90x = 1,685,502,855.50
  5. Step 5: Solve for x
    x = 1,685,502,855.50/52,578.90
  6. Step 6: Final answer
    x = 32,056.64

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1.5x scale

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.