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Finding the Fourth Proportional to 18,891.40, 28,478.59 and 17,622.76

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Solution

The fourth proportional to 18,891.40, 28,478.59 and 17,622.76 is: 26,566.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,891.40 : 28,478.59 = 17,622.76 : x
  2. Step 2: Convert to fraction form
    18,891.40/28,478.59 = 17,622.76/x
  3. Step 3: Cross multiply
    18,891.40x = 28,478.59 × 17,622.76
  4. Step 4: Simplify right side
    18,891.40x = 501,871,356.71
  5. Step 5: Solve for x
    x = 501,871,356.71/18,891.40
  6. Step 6: Final answer
    x = 26,566.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.