Home / 21,029.78-29,023.14-15,715.40

Finding the Fourth Proportional to 21,029.78, 29,023.14 and 15,715.40

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Solution

The fourth proportional to 21,029.78, 29,023.14 and 15,715.40 is: 21,688.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,029.78 : 29,023.14 = 15,715.40 : x
  2. Step 2: Convert to fraction form
    21,029.78/29,023.14 = 15,715.40/x
  3. Step 3: Cross multiply
    21,029.78x = 29,023.14 × 15,715.40
  4. Step 4: Simplify right side
    21,029.78x = 456,110,254.36
  5. Step 5: Solve for x
    x = 456,110,254.36/21,029.78
  6. Step 6: Final answer
    x = 21,688.78

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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.