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Finding the Fourth Proportional to 85,730.40, 128,600.64 and 33,140.16

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Solution

The fourth proportional to 85,730.40, 128,600.64 and 33,140.16 is: 49,712.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,730.40 : 128,600.64 = 33,140.16 : x
  2. Step 2: Convert to fraction form
    85,730.40/128,600.64 = 33,140.16/x
  3. Step 3: Cross multiply
    85,730.40x = 128,600.64 × 33,140.16
  4. Step 4: Simplify right side
    85,730.40x = 4,261,845,785.70
  5. Step 5: Solve for x
    x = 4,261,845,785.70/85,730.40
  6. Step 6: Final answer
    x = 49,712.19

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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.