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Finding the Fourth Proportional to 1,569.44, 2,165.64 and 931.28

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Solution

The fourth proportional to 1,569.44, 2,165.64 and 931.28 is: 1,285.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,569.44 : 2,165.64 = 931.28 : x
  2. Step 2: Convert to fraction form
    1,569.44/2,165.64 = 931.28/x
  3. Step 3: Cross multiply
    1,569.44x = 2,165.64 × 931.28
  4. Step 4: Simplify right side
    1,569.44x = 2,016,802.90
  5. Step 5: Solve for x
    x = 2,016,802.90/1,569.44
  6. Step 6: Final answer
    x = 1,285.05

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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.