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Finding the Fourth Proportional to 18,990.91, 28,492.51 and 9,130.94

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Solution

The fourth proportional to 18,990.91, 28,492.51 and 9,130.94 is: 13,699.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990.91 : 28,492.51 = 9,130.94 : x
  2. Step 2: Convert to fraction form
    18,990.91/28,492.51 = 9,130.94/x
  3. Step 3: Cross multiply
    18,990.91x = 28,492.51 × 9,130.94
  4. Step 4: Simplify right side
    18,990.91x = 260,163,399.26
  5. Step 5: Solve for x
    x = 260,163,399.26/18,990.91
  6. Step 6: Final answer
    x = 13,699.36

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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.