Home / 21,320.48-31,982.40-7,287.20

Finding the Fourth Proportional to 21,320.48, 31,982.40 and 7,287.20

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Solution

The fourth proportional to 21,320.48, 31,982.40 and 7,287.20 is: 10,931.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,320.48 : 31,982.40 = 7,287.20 : x
  2. Step 2: Convert to fraction form
    21,320.48/31,982.40 = 7,287.20/x
  3. Step 3: Cross multiply
    21,320.48x = 31,982.40 × 7,287.20
  4. Step 4: Simplify right side
    21,320.48x = 233,062,145.28
  5. Step 5: Solve for x
    x = 233,062,145.28/21,320.48
  6. Step 6: Final answer
    x = 10,931.37

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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.