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Finding the Fourth Proportional to 85,963.55, 128,963.55 and 25,987.10

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Solution

The fourth proportional to 85,963.55, 128,963.55 and 25,987.10 is: 38,986.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,963.55 : 128,963.55 = 25,987.10 : x
  2. Step 2: Convert to fraction form
    85,963.55/128,963.55 = 25,987.10/x
  3. Step 3: Cross multiply
    85,963.55x = 128,963.55 × 25,987.10
  4. Step 4: Simplify right side
    85,963.55x = 3,351,388,670.21
  5. Step 5: Solve for x
    x = 3,351,388,670.21/85,963.55
  6. Step 6: Final answer
    x = 38,986.16

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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.