Home / 21,389.55-29,456.78-20,931.63

Finding the Fourth Proportional to 21,389.55, 29,456.78 and 20,931.63

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Solution

The fourth proportional to 21,389.55, 29,456.78 and 20,931.63 is: 28,826.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,389.55 : 29,456.78 = 20,931.63 : x
  2. Step 2: Convert to fraction form
    21,389.55/29,456.78 = 20,931.63/x
  3. Step 3: Cross multiply
    21,389.55x = 29,456.78 × 20,931.63
  4. Step 4: Simplify right side
    21,389.55x = 616,578,315.29
  5. Step 5: Solve for x
    x = 616,578,315.29/21,389.55
  6. Step 6: Final answer
    x = 28,826.15

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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.