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Finding the Fourth Proportional to 1,913.31, 2,869.90 and 545.31

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Solution

The fourth proportional to 1,913.31, 2,869.90 and 545.31 is: 817.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,913.31 : 2,869.90 = 545.31 : x
  2. Step 2: Convert to fraction form
    1,913.31/2,869.90 = 545.31/x
  3. Step 3: Cross multiply
    1,913.31x = 2,869.90 × 545.31
  4. Step 4: Simplify right side
    1,913.31x = 1,564,985.17
  5. Step 5: Solve for x
    x = 1,564,985.17/1,913.31
  6. Step 6: Final answer
    x = 817.95

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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.