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Finding the Fourth Proportional to 15,888.10, 21,881.19 and 15,543.72

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Solution

The fourth proportional to 15,888.10, 21,881.19 and 15,543.72 is: 21,406.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,888.10 : 21,881.19 = 15,543.72 : x
  2. Step 2: Convert to fraction form
    15,888.10/21,881.19 = 15,543.72/x
  3. Step 3: Cross multiply
    15,888.10x = 21,881.19 × 15,543.72
  4. Step 4: Simplify right side
    15,888.10x = 340,115,090.63
  5. Step 5: Solve for x
    x = 340,115,090.63/15,888.10
  6. Step 6: Final answer
    x = 21,406.91

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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.