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Finding the Fourth Proportional to 120,810.48, 180,950.76 and 85,643.52

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Solution

The fourth proportional to 120,810.48, 180,950.76 and 85,643.52 is: 128,277.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,810.48 : 180,950.76 = 85,643.52 : x
  2. Step 2: Convert to fraction form
    120,810.48/180,950.76 = 85,643.52/x
  3. Step 3: Cross multiply
    120,810.48x = 180,950.76 × 85,643.52
  4. Step 4: Simplify right side
    120,810.48x = 15,497,260,033.08
  5. Step 5: Solve for x
    x = 15,497,260,033.08/120,810.48
  6. Step 6: Final answer
    x = 128,277.45

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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.