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Finding the Fourth Proportional to 85,440.30, 128,014.65 and 70,568.70

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Solution

The fourth proportional to 85,440.30, 128,014.65 and 70,568.70 is: 105,732.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,440.30 : 128,014.65 = 70,568.70 : x
  2. Step 2: Convert to fraction form
    85,440.30/128,014.65 = 70,568.70/x
  3. Step 3: Cross multiply
    85,440.30x = 128,014.65 × 70,568.70
  4. Step 4: Simplify right side
    85,440.30x = 9,033,827,431.46
  5. Step 5: Solve for x
    x = 9,033,827,431.46/85,440.30
  6. Step 6: Final answer
    x = 105,732.63

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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.