Home / 21,430.58-29,543.76-15,755.31

Finding the Fourth Proportional to 21,430.58, 29,543.76 and 15,755.31

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Solution

The fourth proportional to 21,430.58, 29,543.76 and 15,755.31 is: 21,719.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,430.58 : 29,543.76 = 15,755.31 : x
  2. Step 2: Convert to fraction form
    21,430.58/29,543.76 = 15,755.31/x
  3. Step 3: Cross multiply
    21,430.58x = 29,543.76 × 15,755.31
  4. Step 4: Simplify right side
    21,430.58x = 465,471,097.37
  5. Step 5: Solve for x
    x = 465,471,097.37/21,430.58
  6. Step 6: Final answer
    x = 21,719.95

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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.