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Finding the Fourth Proportional to 85,965.55, 128,966.55 and 25,989.10

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Solution

The fourth proportional to 85,965.55, 128,966.55 and 25,989.10 is: 38,989.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,965.55 : 128,966.55 = 25,989.10 : x
  2. Step 2: Convert to fraction form
    85,965.55/128,966.55 = 25,989.10/x
  3. Step 3: Cross multiply
    85,965.55x = 128,966.55 × 25,989.10
  4. Step 4: Simplify right side
    85,965.55x = 3,351,724,564.61
  5. Step 5: Solve for x
    x = 3,351,724,564.61/85,965.55
  6. Step 6: Final answer
    x = 38,989.16

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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.