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Finding the Fourth Proportional to 15,883.55, 21,918.74 and 8,810.63

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Solution

The fourth proportional to 15,883.55, 21,918.74 and 8,810.63 is: 12,158.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,883.55 : 21,918.74 = 8,810.63 : x
  2. Step 2: Convert to fraction form
    15,883.55/21,918.74 = 8,810.63/x
  3. Step 3: Cross multiply
    15,883.55x = 21,918.74 × 8,810.63
  4. Step 4: Simplify right side
    15,883.55x = 193,117,985.03
  5. Step 5: Solve for x
    x = 193,117,985.03/15,883.55
  6. Step 6: Final answer
    x = 12,158.36

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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.