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Finding the Fourth Proportional to 15,683.13, 21,652.85 and 9,721.13

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Solution

The fourth proportional to 15,683.13, 21,652.85 and 9,721.13 is: 13,421.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,683.13 : 21,652.85 = 9,721.13 : x
  2. Step 2: Convert to fraction form
    15,683.13/21,652.85 = 9,721.13/x
  3. Step 3: Cross multiply
    15,683.13x = 21,652.85 × 9,721.13
  4. Step 4: Simplify right side
    15,683.13x = 210,490,085.76
  5. Step 5: Solve for x
    x = 210,490,085.76/15,683.13
  6. Step 6: Final answer
    x = 13,421.43

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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.