Home / 28,515.78-42,780.96-11,870.28

Finding the Fourth Proportional to 28,515.78, 42,780.96 and 11,870.28

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Solution

The fourth proportional to 28,515.78, 42,780.96 and 11,870.28 is: 17,808.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,515.78 : 42,780.96 = 11,870.28 : x
  2. Step 2: Convert to fraction form
    28,515.78/42,780.96 = 11,870.28/x
  3. Step 3: Cross multiply
    28,515.78x = 42,780.96 × 11,870.28
  4. Step 4: Simplify right side
    28,515.78x = 507,821,973.87
  5. Step 5: Solve for x
    x = 507,821,973.87/28,515.78
  6. Step 6: Final answer
    x = 17,808.45

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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.