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Finding the Fourth Proportional to 85,763.12, 128,657.12 and 26,603.54

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Solution

The fourth proportional to 85,763.12, 128,657.12 and 26,603.54 is: 39,909.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,763.12 : 128,657.12 = 26,603.54 : x
  2. Step 2: Convert to fraction form
    85,763.12/128,657.12 = 26,603.54/x
  3. Step 3: Cross multiply
    85,763.12x = 128,657.12 × 26,603.54
  4. Step 4: Simplify right side
    85,763.12x = 3,422,734,838.20
  5. Step 5: Solve for x
    x = 3,422,734,838.20/85,763.12
  6. Step 6: Final answer
    x = 39,909.17

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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.