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Finding the Fourth Proportional to 85,438.40, 128,287.20 and 65,739.20

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Solution

The fourth proportional to 85,438.40, 128,287.20 and 65,739.20 is: 98,708.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,438.40 : 128,287.20 = 65,739.20 : x
  2. Step 2: Convert to fraction form
    85,438.40/128,287.20 = 65,739.20/x
  3. Step 3: Cross multiply
    85,438.40x = 128,287.20 × 65,739.20
  4. Step 4: Simplify right side
    85,438.40x = 8,433,497,898.24
  5. Step 5: Solve for x
    x = 8,433,497,898.24/85,438.40
  6. Step 6: Final answer
    x = 98,708.52

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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.