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Finding the Fourth Proportional to 14,555.47, 20,086.55 and 7,931.47

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Solution

The fourth proportional to 14,555.47, 20,086.55 and 7,931.47 is: 10,945.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,555.47 : 20,086.55 = 7,931.47 : x
  2. Step 2: Convert to fraction form
    14,555.47/20,086.55 = 7,931.47/x
  3. Step 3: Cross multiply
    14,555.47x = 20,086.55 × 7,931.47
  4. Step 4: Simplify right side
    14,555.47x = 159,315,829.07
  5. Step 5: Solve for x
    x = 159,315,829.07/14,555.47
  6. Step 6: Final answer
    x = 10,945.43

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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.