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Finding the Fourth Proportional to 14,775.88, 20,390.62 and 8,402.47

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Solution

The fourth proportional to 14,775.88, 20,390.62 and 8,402.47 is: 11,595.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,775.88 : 20,390.62 = 8,402.47 : x
  2. Step 2: Convert to fraction form
    14,775.88/20,390.62 = 8,402.47/x
  3. Step 3: Cross multiply
    14,775.88x = 20,390.62 × 8,402.47
  4. Step 4: Simplify right side
    14,775.88x = 171,331,530.82
  5. Step 5: Solve for x
    x = 171,331,530.82/14,775.88
  6. Step 6: Final answer
    x = 11,595.35

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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.