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Finding the Fourth Proportional to 28,519.80, 42,779.70 and 7,459.80

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Solution

The fourth proportional to 28,519.80, 42,779.70 and 7,459.80 is: 11,189.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,519.80 : 42,779.70 = 7,459.80 : x
  2. Step 2: Convert to fraction form
    28,519.80/42,779.70 = 7,459.80/x
  3. Step 3: Cross multiply
    28,519.80x = 42,779.70 × 7,459.80
  4. Step 4: Simplify right side
    28,519.80x = 319,128,006.06
  5. Step 5: Solve for x
    x = 319,128,006.06/28,519.80
  6. Step 6: Final answer
    x = 11,189.70

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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.