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Finding the Fourth Proportional to 15,710.63, 21,680.70 and 8,637.10

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Solution

The fourth proportional to 15,710.63, 21,680.70 and 8,637.10 is: 11,919.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,710.63 : 21,680.70 = 8,637.10 : x
  2. Step 2: Convert to fraction form
    15,710.63/21,680.70 = 8,637.10/x
  3. Step 3: Cross multiply
    15,710.63x = 21,680.70 × 8,637.10
  4. Step 4: Simplify right side
    15,710.63x = 187,258,319.77
  5. Step 5: Solve for x
    x = 187,258,319.77/15,710.63
  6. Step 6: Final answer
    x = 11,919.22

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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.