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Finding the Fourth Proportional to 1,916.92, 2,875.58 and 820.99

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Solution

The fourth proportional to 1,916.92, 2,875.58 and 820.99 is: 1,231.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,916.92 : 2,875.58 = 820.99 : x
  2. Step 2: Convert to fraction form
    1,916.92/2,875.58 = 820.99/x
  3. Step 3: Cross multiply
    1,916.92x = 2,875.58 × 820.99
  4. Step 4: Simplify right side
    1,916.92x = 2,360,822.42
  5. Step 5: Solve for x
    x = 2,360,822.42/1,916.92
  6. Step 6: Final answer
    x = 1,231.57

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1.5x scale

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.