Home / 1,856.08-2,785.21-686.91

Finding the Fourth Proportional to 1,856.08, 2,785.21 and 686.91

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Solution

The fourth proportional to 1,856.08, 2,785.21 and 686.91 is: 1,030.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,856.08 : 2,785.21 = 686.91 : x
  2. Step 2: Convert to fraction form
    1,856.08/2,785.21 = 686.91/x
  3. Step 3: Cross multiply
    1,856.08x = 2,785.21 × 686.91
  4. Step 4: Simplify right side
    1,856.08x = 1,913,188.60
  5. Step 5: Solve for x
    x = 1,913,188.60/1,856.08
  6. Step 6: Final answer
    x = 1,030.77

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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.