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Finding the Fourth Proportional to 66,620.70, 99,821.70 and 56,779.20

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Solution

The fourth proportional to 66,620.70, 99,821.70 and 56,779.20 is: 85,075.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,620.70 : 99,821.70 = 56,779.20 : x
  2. Step 2: Convert to fraction form
    66,620.70/99,821.70 = 56,779.20/x
  3. Step 3: Cross multiply
    66,620.70x = 99,821.70 × 56,779.20
  4. Step 4: Simplify right side
    66,620.70x = 5,667,796,268.64
  5. Step 5: Solve for x
    x = 5,667,796,268.64/66,620.70
  6. Step 6: Final answer
    x = 85,075.60

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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.