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Finding the Fourth Proportional to 285,765.20, 428,647.80 and 144,047.60

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Solution

The fourth proportional to 285,765.20, 428,647.80 and 144,047.60 is: 216,071.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,765.20 : 428,647.80 = 144,047.60 : x
  2. Step 2: Convert to fraction form
    285,765.20/428,647.80 = 144,047.60/x
  3. Step 3: Cross multiply
    285,765.20x = 428,647.80 × 144,047.60
  4. Step 4: Simplify right side
    285,765.20x = 61,745,686,835.28
  5. Step 5: Solve for x
    x = 61,745,686,835.28/285,765.20
  6. Step 6: Final answer
    x = 216,071.40

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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.