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Finding the Fourth Proportional to 85,980.99, 128,971.39 and 56,391.90

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Solution

The fourth proportional to 85,980.99, 128,971.39 and 56,391.90 is: 84,587.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,980.99 : 128,971.39 = 56,391.90 : x
  2. Step 2: Convert to fraction form
    85,980.99/128,971.39 = 56,391.90/x
  3. Step 3: Cross multiply
    85,980.99x = 128,971.39 × 56,391.90
  4. Step 4: Simplify right side
    85,980.99x = 7,272,941,208.85
  5. Step 5: Solve for x
    x = 7,272,941,208.85/85,980.99
  6. Step 6: Final answer
    x = 84,587.78

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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.