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Finding the Fourth Proportional to 1,564.12, 2,158.26 and 943

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Solution

The fourth proportional to 1,564.12, 2,158.26 and 943 is: 1,301.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,564.12 : 2,158.26 = 943 : x
  2. Step 2: Convert to fraction form
    1,564.12/2,158.26 = 943/x
  3. Step 3: Cross multiply
    1,564.12x = 2,158.26 × 943
  4. Step 4: Simplify right side
    1,564.12x = 2,035,239.18
  5. Step 5: Solve for x
    x = 2,035,239.18/1,564.12
  6. Step 6: Final answer
    x = 1,301.20

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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.