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Finding the Fourth Proportional to 3,128.52, 4,689.13 and 1,393.50

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Solution

The fourth proportional to 3,128.52, 4,689.13 and 1,393.50 is: 2,088.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,128.52 : 4,689.13 = 1,393.50 : x
  2. Step 2: Convert to fraction form
    3,128.52/4,689.13 = 1,393.50/x
  3. Step 3: Cross multiply
    3,128.52x = 4,689.13 × 1,393.50
  4. Step 4: Simplify right side
    3,128.52x = 6,534,302.66
  5. Step 5: Solve for x
    x = 6,534,302.66/3,128.52
  6. Step 6: Final answer
    x = 2,088.62

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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.