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Finding the Fourth Proportional to 2,807.84, 3,875.80 and 1,689.12

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Solution

The fourth proportional to 2,807.84, 3,875.80 and 1,689.12 is: 2,331.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,807.84 : 3,875.80 = 1,689.12 : x
  2. Step 2: Convert to fraction form
    2,807.84/3,875.80 = 1,689.12/x
  3. Step 3: Cross multiply
    2,807.84x = 3,875.80 × 1,689.12
  4. Step 4: Simplify right side
    2,807.84x = 6,546,691.30
  5. Step 5: Solve for x
    x = 6,546,691.30/2,807.84
  6. Step 6: Final answer
    x = 2,331.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.