Home / 3,178.64-4,386.28-1,781.20

Finding the Fourth Proportional to 3,178.64, 4,386.28 and 1,781.20

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Solution

The fourth proportional to 3,178.64, 4,386.28 and 1,781.20 is: 2,457.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,178.64 : 4,386.28 = 1,781.20 : x
  2. Step 2: Convert to fraction form
    3,178.64/4,386.28 = 1,781.20/x
  3. Step 3: Cross multiply
    3,178.64x = 4,386.28 × 1,781.20
  4. Step 4: Simplify right side
    3,178.64x = 7,812,841.94
  5. Step 5: Solve for x
    x = 7,812,841.94/3,178.64
  6. Step 6: Final answer
    x = 2,457.92

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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.