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Finding the Fourth Proportional to 80,745.90, 121,140.45 and 57,417.90

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Solution

The fourth proportional to 80,745.90, 121,140.45 and 57,417.90 is: 86,142.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,745.90 : 121,140.45 = 57,417.90 : x
  2. Step 2: Convert to fraction form
    80,745.90/121,140.45 = 57,417.90/x
  3. Step 3: Cross multiply
    80,745.90x = 121,140.45 × 57,417.90
  4. Step 4: Simplify right side
    80,745.90x = 6,955,630,244.06
  5. Step 5: Solve for x
    x = 6,955,630,244.06/80,745.90
  6. Step 6: Final answer
    x = 86,142.21

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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.