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Finding the Fourth Proportional to 85,656.90, 128,485.35 and 76,908.90

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Solution

The fourth proportional to 85,656.90, 128,485.35 and 76,908.90 is: 115,363.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,656.90 : 128,485.35 = 76,908.90 : x
  2. Step 2: Convert to fraction form
    85,656.90/128,485.35 = 76,908.90/x
  3. Step 3: Cross multiply
    85,656.90x = 128,485.35 × 76,908.90
  4. Step 4: Simplify right side
    85,656.90x = 9,881,666,934.62
  5. Step 5: Solve for x
    x = 9,881,666,934.62/85,656.90
  6. Step 6: Final answer
    x = 115,363.35

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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.