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Finding the Fourth Proportional to 64,986.80, 91,178.35 and 64,986.80

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Solution

The fourth proportional to 64,986.80, 91,178.35 and 64,986.80 is: 91,178.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,986.80 : 91,178.35 = 64,986.80 : x
  2. Step 2: Convert to fraction form
    64,986.80/91,178.35 = 64,986.80/x
  3. Step 3: Cross multiply
    64,986.80x = 91,178.35 × 64,986.80
  4. Step 4: Simplify right side
    64,986.80x = 5,925,389,195.78
  5. Step 5: Solve for x
    x = 5,925,389,195.78/64,986.80
  6. Step 6: Final answer
    x = 91,178.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.