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Finding the Fourth Proportional to 129,779.98, 179,092.47 and 72,420.82

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Solution

The fourth proportional to 129,779.98, 179,092.47 and 72,420.82 is: 99,938.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,779.98 : 179,092.47 = 72,420.82 : x
  2. Step 2: Convert to fraction form
    129,779.98/179,092.47 = 72,420.82/x
  3. Step 3: Cross multiply
    129,779.98x = 179,092.47 × 72,420.82
  4. Step 4: Simplify right side
    129,779.98x = 12,970,023,533.23
  5. Step 5: Solve for x
    x = 12,970,023,533.23/129,779.98
  6. Step 6: Final answer
    x = 99,938.55

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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.