Home / 66,431.20-99,646.80-42,811.60

Finding the Fourth Proportional to 66,431.20, 99,646.80 and 42,811.60

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Solution

The fourth proportional to 66,431.20, 99,646.80 and 42,811.60 is: 64,217.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,431.20 : 99,646.80 = 42,811.60 : x
  2. Step 2: Convert to fraction form
    66,431.20/99,646.80 = 42,811.60/x
  3. Step 3: Cross multiply
    66,431.20x = 99,646.80 × 42,811.60
  4. Step 4: Simplify right side
    66,431.20x = 4,266,038,942.88
  5. Step 5: Solve for x
    x = 4,266,038,942.88/66,431.20
  6. Step 6: Final answer
    x = 64,217.40

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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.