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Finding the Fourth Proportional to 1,415.90, 1,952.88 and 918.56

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Solution

The fourth proportional to 1,415.90, 1,952.88 and 918.56 is: 1,266.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.90 : 1,952.88 = 918.56 : x
  2. Step 2: Convert to fraction form
    1,415.90/1,952.88 = 918.56/x
  3. Step 3: Cross multiply
    1,415.90x = 1,952.88 × 918.56
  4. Step 4: Simplify right side
    1,415.90x = 1,793,837.45
  5. Step 5: Solve for x
    x = 1,793,837.45/1,415.90
  6. Step 6: Final answer
    x = 1,266.92

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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.