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Finding the Fourth Proportional to 14,475.47, 19,978.29 and 9,170.78

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Solution

The fourth proportional to 14,475.47, 19,978.29 and 9,170.78 is: 12,657.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,475.47 : 19,978.29 = 9,170.78 : x
  2. Step 2: Convert to fraction form
    14,475.47/19,978.29 = 9,170.78/x
  3. Step 3: Cross multiply
    14,475.47x = 19,978.29 × 9,170.78
  4. Step 4: Simplify right side
    14,475.47x = 183,216,402.47
  5. Step 5: Solve for x
    x = 183,216,402.47/14,475.47
  6. Step 6: Final answer
    x = 12,657.03

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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.