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Finding the Fourth Proportional to 1,564, 2,158.10 and 1,328.90

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Solution

The fourth proportional to 1,564, 2,158.10 and 1,328.90 is: 1,833.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,564 : 2,158.10 = 1,328.90 : x
  2. Step 2: Convert to fraction form
    1,564/2,158.10 = 1,328.90/x
  3. Step 3: Cross multiply
    1,564x = 2,158.10 × 1,328.90
  4. Step 4: Simplify right side
    1,564x = 2,867,899.09
  5. Step 5: Solve for x
    x = 2,867,899.09/1,564
  6. Step 6: Final answer
    x = 1,833.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.