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Finding the Fourth Proportional to 92,911.10, 128,215.16 and 54,146.45

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Solution

The fourth proportional to 92,911.10, 128,215.16 and 54,146.45 is: 74,720.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,911.10 : 128,215.16 = 54,146.45 : x
  2. Step 2: Convert to fraction form
    92,911.10/128,215.16 = 54,146.45/x
  3. Step 3: Cross multiply
    92,911.10x = 128,215.16 × 54,146.45
  4. Step 4: Simplify right side
    92,911.10x = 6,942,395,750.18
  5. Step 5: Solve for x
    x = 6,942,395,750.18/92,911.10
  6. Step 6: Final answer
    x = 74,720.84

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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.