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Finding the Fourth Proportional to 81,000.90, 121,501.35 and 78,813.90

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Solution

The fourth proportional to 81,000.90, 121,501.35 and 78,813.90 is: 118,220.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,000.90 : 121,501.35 = 78,813.90 : x
  2. Step 2: Convert to fraction form
    81,000.90/121,501.35 = 78,813.90/x
  3. Step 3: Cross multiply
    81,000.90x = 121,501.35 × 78,813.90
  4. Step 4: Simplify right side
    81,000.90x = 9,575,995,248.77
  5. Step 5: Solve for x
    x = 9,575,995,248.77/81,000.90
  6. Step 6: Final answer
    x = 118,220.85

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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.