Home / 15,789.60-21,789-10,116.36

Finding the Fourth Proportional to 15,789.60, 21,789 and 10,116.36

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Solution

The fourth proportional to 15,789.60, 21,789 and 10,116.36 is: 13,960.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,789.60 : 21,789 = 10,116.36 : x
  2. Step 2: Convert to fraction form
    15,789.60/21,789 = 10,116.36/x
  3. Step 3: Cross multiply
    15,789.60x = 21,789 × 10,116.36
  4. Step 4: Simplify right side
    15,789.60x = 220,425,368.04
  5. Step 5: Solve for x
    x = 220,425,368.04/15,789.60
  6. Step 6: Final answer
    x = 13,960.16

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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.