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Finding the Fourth Proportional to 60,651.84, 90,978 and 21,209.04

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Solution

The fourth proportional to 60,651.84, 90,978 and 21,209.04 is: 31,813.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,651.84 : 90,978 = 21,209.04 : x
  2. Step 2: Convert to fraction form
    60,651.84/90,978 = 21,209.04/x
  3. Step 3: Cross multiply
    60,651.84x = 90,978 × 21,209.04
  4. Step 4: Simplify right side
    60,651.84x = 1,929,556,041.12
  5. Step 5: Solve for x
    x = 1,929,556,041.12/60,651.84
  6. Step 6: Final answer
    x = 31,813.64

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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.