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Finding the Fourth Proportional to 28,298.70, 42,338.70 and 18,457.20

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Solution

The fourth proportional to 28,298.70, 42,338.70 and 18,457.20 is: 27,614.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,298.70 : 42,338.70 = 18,457.20 : x
  2. Step 2: Convert to fraction form
    28,298.70/42,338.70 = 18,457.20/x
  3. Step 3: Cross multiply
    28,298.70x = 42,338.70 × 18,457.20
  4. Step 4: Simplify right side
    28,298.70x = 781,453,853.64
  5. Step 5: Solve for x
    x = 781,453,853.64/28,298.70
  6. Step 6: Final answer
    x = 27,614.48

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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.