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Finding the Fourth Proportional to 85,411.20, 128,116.80 and 46,045.20

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Solution

The fourth proportional to 85,411.20, 128,116.80 and 46,045.20 is: 69,067.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,411.20 : 128,116.80 = 46,045.20 : x
  2. Step 2: Convert to fraction form
    85,411.20/128,116.80 = 46,045.20/x
  3. Step 3: Cross multiply
    85,411.20x = 128,116.80 × 46,045.20
  4. Step 4: Simplify right side
    85,411.20x = 5,899,163,679.36
  5. Step 5: Solve for x
    x = 5,899,163,679.36/85,411.20
  6. Step 6: Final answer
    x = 69,067.80

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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.