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Finding the Fourth Proportional to 66,389.40, 91,303.50 and 52,800.84

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Solution

The fourth proportional to 66,389.40, 91,303.50 and 52,800.84 is: 72,615.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,389.40 : 91,303.50 = 52,800.84 : x
  2. Step 2: Convert to fraction form
    66,389.40/91,303.50 = 52,800.84/x
  3. Step 3: Cross multiply
    66,389.40x = 91,303.50 × 52,800.84
  4. Step 4: Simplify right side
    66,389.40x = 4,820,901,494.94
  5. Step 5: Solve for x
    x = 4,820,901,494.94/66,389.40
  6. Step 6: Final answer
    x = 72,615.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.