Home / 28,430.78-42,649.50-11,788.72

Finding the Fourth Proportional to 28,430.78, 42,649.50 and 11,788.72

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Solution

The fourth proportional to 28,430.78, 42,649.50 and 11,788.72 is: 17,684.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,430.78 : 42,649.50 = 11,788.72 : x
  2. Step 2: Convert to fraction form
    28,430.78/42,649.50 = 11,788.72/x
  3. Step 3: Cross multiply
    28,430.78x = 42,649.50 × 11,788.72
  4. Step 4: Simplify right side
    28,430.78x = 502,783,013.64
  5. Step 5: Solve for x
    x = 502,783,013.64/28,430.78
  6. Step 6: Final answer
    x = 17,684.46

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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.