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Finding the Fourth Proportional to 1,290.16, 1,935.10 and 876.35

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Solution

The fourth proportional to 1,290.16, 1,935.10 and 876.35 is: 1,314.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.16 : 1,935.10 = 876.35 : x
  2. Step 2: Convert to fraction form
    1,290.16/1,935.10 = 876.35/x
  3. Step 3: Cross multiply
    1,290.16x = 1,935.10 × 876.35
  4. Step 4: Simplify right side
    1,290.16x = 1,695,830.82
  5. Step 5: Solve for x
    x = 1,695,830.82/1,290.16
  6. Step 6: Final answer
    x = 1,314.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.