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Finding the Fourth Proportional to 1,856.71, 2,784.29 and 686.46

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Solution

The fourth proportional to 1,856.71, 2,784.29 and 686.46 is: 1,029.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,856.71 : 2,784.29 = 686.46 : x
  2. Step 2: Convert to fraction form
    1,856.71/2,784.29 = 686.46/x
  3. Step 3: Cross multiply
    1,856.71x = 2,784.29 × 686.46
  4. Step 4: Simplify right side
    1,856.71x = 1,911,303.71
  5. Step 5: Solve for x
    x = 1,911,303.71/1,856.71
  6. Step 6: Final answer
    x = 1,029.40

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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.