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Finding the Fourth Proportional to 21,990.81, 32,990.27 and 7,200.55

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Solution

The fourth proportional to 21,990.81, 32,990.27 and 7,200.55 is: 10,802.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.81 : 32,990.27 = 7,200.55 : x
  2. Step 2: Convert to fraction form
    21,990.81/32,990.27 = 7,200.55/x
  3. Step 3: Cross multiply
    21,990.81x = 32,990.27 × 7,200.55
  4. Step 4: Simplify right side
    21,990.81x = 237,547,887.69
  5. Step 5: Solve for x
    x = 237,547,887.69/21,990.81
  6. Step 6: Final answer
    x = 10,802.14

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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.