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Finding the Fourth Proportional to 1,574, 2,172.66 and 953

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Solution

The fourth proportional to 1,574, 2,172.66 and 953 is: 1,315.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,574 : 2,172.66 = 953 : x
  2. Step 2: Convert to fraction form
    1,574/2,172.66 = 953/x
  3. Step 3: Cross multiply
    1,574x = 2,172.66 × 953
  4. Step 4: Simplify right side
    1,574x = 2,070,544.98
  5. Step 5: Solve for x
    x = 2,070,544.98/1,574
  6. Step 6: Final answer
    x = 1,315.47

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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.