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Finding the Fourth Proportional to 91,307.38, 126,039.30 and 81,730.35

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Solution

The fourth proportional to 91,307.38, 126,039.30 and 81,730.35 is: 112,819.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,307.38 : 126,039.30 = 81,730.35 : x
  2. Step 2: Convert to fraction form
    91,307.38/126,039.30 = 81,730.35/x
  3. Step 3: Cross multiply
    91,307.38x = 126,039.30 × 81,730.35
  4. Step 4: Simplify right side
    91,307.38x = 10,301,236,102.76
  5. Step 5: Solve for x
    x = 10,301,236,102.76/91,307.38
  6. Step 6: Final answer
    x = 112,819.32

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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.