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Finding the Fourth Proportional to 92,130.72, 138,014.64 and 85,650.72

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Solution

The fourth proportional to 92,130.72, 138,014.64 and 85,650.72 is: 128,307.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,130.72 : 138,014.64 = 85,650.72 : x
  2. Step 2: Convert to fraction form
    92,130.72/138,014.64 = 85,650.72/x
  3. Step 3: Cross multiply
    92,130.72x = 138,014.64 × 85,650.72
  4. Step 4: Simplify right side
    92,130.72x = 11,821,053,286.54
  5. Step 5: Solve for x
    x = 11,821,053,286.54/92,130.72
  6. Step 6: Final answer
    x = 128,307.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.