Home / 85,965.10-128,947.65-81,372.40

Finding the Fourth Proportional to 85,965.10, 128,947.65 and 81,372.40

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Solution

The fourth proportional to 85,965.10, 128,947.65 and 81,372.40 is: 122,058.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,965.10 : 128,947.65 = 81,372.40 : x
  2. Step 2: Convert to fraction form
    85,965.10/128,947.65 = 81,372.40/x
  3. Step 3: Cross multiply
    85,965.10x = 128,947.65 × 81,372.40
  4. Step 4: Simplify right side
    85,965.10x = 10,492,779,754.86
  5. Step 5: Solve for x
    x = 10,492,779,754.86/85,965.10
  6. Step 6: Final answer
    x = 122,058.60

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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.