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Finding the Fourth Proportional to 15,671.16, 21,630 and 10,643.76

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Solution

The fourth proportional to 15,671.16, 21,630 and 10,643.76 is: 14,690.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,671.16 : 21,630 = 10,643.76 : x
  2. Step 2: Convert to fraction form
    15,671.16/21,630 = 10,643.76/x
  3. Step 3: Cross multiply
    15,671.16x = 21,630 × 10,643.76
  4. Step 4: Simplify right side
    15,671.16x = 230,224,528.80
  5. Step 5: Solve for x
    x = 230,224,528.80/15,671.16
  6. Step 6: Final answer
    x = 14,690.97

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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.