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Finding the Fourth Proportional to 66,428.80, 99,643.20 and 57,788.80

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Solution

The fourth proportional to 66,428.80, 99,643.20 and 57,788.80 is: 86,683.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,428.80 : 99,643.20 = 57,788.80 : x
  2. Step 2: Convert to fraction form
    66,428.80/99,643.20 = 57,788.80/x
  3. Step 3: Cross multiply
    66,428.80x = 99,643.20 × 57,788.80
  4. Step 4: Simplify right side
    66,428.80x = 5,758,260,956.16
  5. Step 5: Solve for x
    x = 5,758,260,956.16/66,428.80
  6. Step 6: Final answer
    x = 86,683.20

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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.