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Finding the Fourth Proportional to 1,856.61, 2,780.79 and 1,335.06

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Solution

The fourth proportional to 1,856.61, 2,780.79 and 1,335.06 is: 1,999.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,856.61 : 2,780.79 = 1,335.06 : x
  2. Step 2: Convert to fraction form
    1,856.61/2,780.79 = 1,335.06/x
  3. Step 3: Cross multiply
    1,856.61x = 2,780.79 × 1,335.06
  4. Step 4: Simplify right side
    1,856.61x = 3,712,521.50
  5. Step 5: Solve for x
    x = 3,712,521.50/1,856.61
  6. Step 6: Final answer
    x = 1,999.62

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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.