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Finding the Fourth Proportional to 21,990.68, 30,345.16 and 13,036.68

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Solution

The fourth proportional to 21,990.68, 30,345.16 and 13,036.68 is: 17,989.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.68 : 30,345.16 = 13,036.68 : x
  2. Step 2: Convert to fraction form
    21,990.68/30,345.16 = 13,036.68/x
  3. Step 3: Cross multiply
    21,990.68x = 30,345.16 × 13,036.68
  4. Step 4: Simplify right side
    21,990.68x = 395,600,140.47
  5. Step 5: Solve for x
    x = 395,600,140.47/21,990.68
  6. Step 6: Final answer
    x = 17,989.45

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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.