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Finding the Fourth Proportional to 72,421.12, 108,630.80 and 19,830.56

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Solution

The fourth proportional to 72,421.12, 108,630.80 and 19,830.56 is: 29,745.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,421.12 : 108,630.80 = 19,830.56 : x
  2. Step 2: Convert to fraction form
    72,421.12/108,630.80 = 19,830.56/x
  3. Step 3: Cross multiply
    72,421.12x = 108,630.80 × 19,830.56
  4. Step 4: Simplify right side
    72,421.12x = 2,154,209,597.25
  5. Step 5: Solve for x
    x = 2,154,209,597.25/72,421.12
  6. Step 6: Final answer
    x = 29,745.60

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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.