Home / 28,515.28-42,780.21-11,869.78

Finding the Fourth Proportional to 28,515.28, 42,780.21 and 11,869.78

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Solution

The fourth proportional to 28,515.28, 42,780.21 and 11,869.78 is: 17,807.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,515.28 : 42,780.21 = 11,869.78 : x
  2. Step 2: Convert to fraction form
    28,515.28/42,780.21 = 11,869.78/x
  3. Step 3: Cross multiply
    28,515.28x = 42,780.21 × 11,869.78
  4. Step 4: Simplify right side
    28,515.28x = 507,791,574.10
  5. Step 5: Solve for x
    x = 507,791,574.10/28,515.28
  6. Step 6: Final answer
    x = 17,807.70

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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.