Home / 21,730.61-29,987.21-13,345.49

Finding the Fourth Proportional to 21,730.61, 29,987.21 and 13,345.49

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Solution

The fourth proportional to 21,730.61, 29,987.21 and 13,345.49 is: 18,416.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,730.61 : 29,987.21 = 13,345.49 : x
  2. Step 2: Convert to fraction form
    21,730.61/29,987.21 = 13,345.49/x
  3. Step 3: Cross multiply
    21,730.61x = 29,987.21 × 13,345.49
  4. Step 4: Simplify right side
    21,730.61x = 400,193,944.46
  5. Step 5: Solve for x
    x = 400,193,944.46/21,730.61
  6. Step 6: Final answer
    x = 18,416.14

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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.