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Finding the Fourth Proportional to 18,140.76, 25,034.13 and 11,430.72

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Solution

The fourth proportional to 18,140.76, 25,034.13 and 11,430.72 is: 15,774.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,140.76 : 25,034.13 = 11,430.72 : x
  2. Step 2: Convert to fraction form
    18,140.76/25,034.13 = 11,430.72/x
  3. Step 3: Cross multiply
    18,140.76x = 25,034.13 × 11,430.72
  4. Step 4: Simplify right side
    18,140.76x = 286,158,130.47
  5. Step 5: Solve for x
    x = 286,158,130.47/18,140.76
  6. Step 6: Final answer
    x = 15,774.32

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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.