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Finding the Fourth Proportional to 18,557.89, 25,602.39 and 12,897.20

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Solution

The fourth proportional to 18,557.89, 25,602.39 and 12,897.20 is: 17,792.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,557.89 : 25,602.39 = 12,897.20 : x
  2. Step 2: Convert to fraction form
    18,557.89/25,602.39 = 12,897.20/x
  3. Step 3: Cross multiply
    18,557.89x = 25,602.39 × 12,897.20
  4. Step 4: Simplify right side
    18,557.89x = 330,199,208.31
  5. Step 5: Solve for x
    x = 330,199,208.31/18,557.89
  6. Step 6: Final answer
    x = 17,792.93

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Half scale
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Double scale
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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.