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Finding the Fourth Proportional to 90,709.20, 127,124.10 and 90,709.20

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Solution

The fourth proportional to 90,709.20, 127,124.10 and 90,709.20 is: 127,124.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,709.20 : 127,124.10 = 90,709.20 : x
  2. Step 2: Convert to fraction form
    90,709.20/127,124.10 = 90,709.20/x
  3. Step 3: Cross multiply
    90,709.20x = 127,124.10 × 90,709.20
  4. Step 4: Simplify right side
    90,709.20x = 11,531,325,411.72
  5. Step 5: Solve for x
    x = 11,531,325,411.72/90,709.20
  6. Step 6: Final answer
    x = 127,124.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.