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Finding the Fourth Proportional to 30,671.40, 42,305.40 and 29,642.88

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Solution

The fourth proportional to 30,671.40, 42,305.40 and 29,642.88 is: 40,886.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,671.40 : 42,305.40 = 29,642.88 : x
  2. Step 2: Convert to fraction form
    30,671.40/42,305.40 = 29,642.88/x
  3. Step 3: Cross multiply
    30,671.40x = 42,305.40 × 29,642.88
  4. Step 4: Simplify right side
    30,671.40x = 1,254,053,895.55
  5. Step 5: Solve for x
    x = 1,254,053,895.55/30,671.40
  6. Step 6: Final answer
    x = 40,886.75

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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.