Home / 21,128.13-29,130.39-15,458.31

Finding the Fourth Proportional to 21,128.13, 29,130.39 and 15,458.31

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Solution

The fourth proportional to 21,128.13, 29,130.39 and 15,458.31 is: 21,313.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,128.13 : 29,130.39 = 15,458.31 : x
  2. Step 2: Convert to fraction form
    21,128.13/29,130.39 = 15,458.31/x
  3. Step 3: Cross multiply
    21,128.13x = 29,130.39 × 15,458.31
  4. Step 4: Simplify right side
    21,128.13x = 450,306,599.04
  5. Step 5: Solve for x
    x = 450,306,599.04/21,128.13
  6. Step 6: Final answer
    x = 21,313.13

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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.