Home / 81,000.72-121,502.16-28,411.74

Finding the Fourth Proportional to 81,000.72, 121,502.16 and 28,411.74

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Solution

The fourth proportional to 81,000.72, 121,502.16 and 28,411.74 is: 42,617.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,000.72 : 121,502.16 = 28,411.74 : x
  2. Step 2: Convert to fraction form
    81,000.72/121,502.16 = 28,411.74/x
  3. Step 3: Cross multiply
    81,000.72x = 121,502.16 × 28,411.74
  4. Step 4: Simplify right side
    81,000.72x = 3,452,087,779.36
  5. Step 5: Solve for x
    x = 3,452,087,779.36/81,000.72
  6. Step 6: Final answer
    x = 42,617.99

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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.