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Finding the Fourth Proportional to 18,962.81, 28,447.29 and 7,117.51

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Solution

The fourth proportional to 18,962.81, 28,447.29 and 7,117.51 is: 10,677.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,962.81 : 28,447.29 = 7,117.51 : x
  2. Step 2: Convert to fraction form
    18,962.81/28,447.29 = 7,117.51/x
  3. Step 3: Cross multiply
    18,962.81x = 28,447.29 × 7,117.51
  4. Step 4: Simplify right side
    18,962.81x = 202,473,803.26
  5. Step 5: Solve for x
    x = 202,473,803.26/18,962.81
  6. Step 6: Final answer
    x = 10,677.42

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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.