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Finding the Fourth Proportional to 21,989.60, 32,986.80 and 21,298.40

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Solution

The fourth proportional to 21,989.60, 32,986.80 and 21,298.40 is: 31,949.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,989.60 : 32,986.80 = 21,298.40 : x
  2. Step 2: Convert to fraction form
    21,989.60/32,986.80 = 21,298.40/x
  3. Step 3: Cross multiply
    21,989.60x = 32,986.80 × 21,298.40
  4. Step 4: Simplify right side
    21,989.60x = 702,566,061.12
  5. Step 5: Solve for x
    x = 702,566,061.12/21,989.60
  6. Step 6: Final answer
    x = 31,949.92

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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.