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Finding the Fourth Proportional to 1,587.39, 2,381.19 and 547.49

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Solution

The fourth proportional to 1,587.39, 2,381.19 and 547.49 is: 821.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.39 : 2,381.19 = 547.49 : x
  2. Step 2: Convert to fraction form
    1,587.39/2,381.19 = 547.49/x
  3. Step 3: Cross multiply
    1,587.39x = 2,381.19 × 547.49
  4. Step 4: Simplify right side
    1,587.39x = 1,303,681.61
  5. Step 5: Solve for x
    x = 1,303,681.61/1,587.39
  6. Step 6: Final answer
    x = 821.28

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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.