Home / 30,939.10-42,715.29-21,265.21

Finding the Fourth Proportional to 30,939.10, 42,715.29 and 21,265.21

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Solution

The fourth proportional to 30,939.10, 42,715.29 and 21,265.21 is: 29,359.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,939.10 : 42,715.29 = 21,265.21 : x
  2. Step 2: Convert to fraction form
    30,939.10/42,715.29 = 21,265.21/x
  3. Step 3: Cross multiply
    30,939.10x = 42,715.29 × 21,265.21
  4. Step 4: Simplify right side
    30,939.10x = 908,349,612.06
  5. Step 5: Solve for x
    x = 908,349,612.06/30,939.10
  6. Step 6: Final answer
    x = 29,359.28

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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.