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Finding the Fourth Proportional to 85,411.40, 128,246.70 and 65,712.20

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Solution

The fourth proportional to 85,411.40, 128,246.70 and 65,712.20 is: 98,668.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,411.40 : 128,246.70 = 65,712.20 : x
  2. Step 2: Convert to fraction form
    85,411.40/128,246.70 = 65,712.20/x
  3. Step 3: Cross multiply
    85,411.40x = 128,246.70 × 65,712.20
  4. Step 4: Simplify right side
    85,411.40x = 8,427,372,799.74
  5. Step 5: Solve for x
    x = 8,427,372,799.74/85,411.40
  6. Step 6: Final answer
    x = 98,668.01

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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.