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Finding the Fourth Proportional to 81,000.90, 121,501.35 and 28,415.70

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Solution

The fourth proportional to 81,000.90, 121,501.35 and 28,415.70 is: 42,623.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,000.90 : 121,501.35 = 28,415.70 : x
  2. Step 2: Convert to fraction form
    81,000.90/121,501.35 = 28,415.70/x
  3. Step 3: Cross multiply
    81,000.90x = 121,501.35 × 28,415.70
  4. Step 4: Simplify right side
    81,000.90x = 3,452,545,911.20
  5. Step 5: Solve for x
    x = 3,452,545,911.20/81,000.90
  6. Step 6: Final answer
    x = 42,623.55

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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.