Home / 21,095.64-29,115-13,140.36

Finding the Fourth Proportional to 21,095.64, 29,115 and 13,140.36

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Solution

The fourth proportional to 21,095.64, 29,115 and 13,140.36 is: 18,135.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,095.64 : 29,115 = 13,140.36 : x
  2. Step 2: Convert to fraction form
    21,095.64/29,115 = 13,140.36/x
  3. Step 3: Cross multiply
    21,095.64x = 29,115 × 13,140.36
  4. Step 4: Simplify right side
    21,095.64x = 382,581,581.40
  5. Step 5: Solve for x
    x = 382,581,581.40/21,095.64
  6. Step 6: Final answer
    x = 18,135.58

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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.