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Finding the Fourth Proportional to 30,921.95, 42,672.29 and 17,492.90

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Solution

The fourth proportional to 30,921.95, 42,672.29 and 17,492.90 is: 24,140.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,921.95 : 42,672.29 = 17,492.90 : x
  2. Step 2: Convert to fraction form
    30,921.95/42,672.29 = 17,492.90/x
  3. Step 3: Cross multiply
    30,921.95x = 42,672.29 × 17,492.90
  4. Step 4: Simplify right side
    30,921.95x = 746,461,800.92
  5. Step 5: Solve for x
    x = 746,461,800.92/30,921.95
  6. Step 6: Final answer
    x = 24,140.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.