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Finding the Fourth Proportional to 1,145.51, 1,580.58 and 987.96

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Solution

The fourth proportional to 1,145.51, 1,580.58 and 987.96 is: 1,363.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.51 : 1,580.58 = 987.96 : x
  2. Step 2: Convert to fraction form
    1,145.51/1,580.58 = 987.96/x
  3. Step 3: Cross multiply
    1,145.51x = 1,580.58 × 987.96
  4. Step 4: Simplify right side
    1,145.51x = 1,561,549.82
  5. Step 5: Solve for x
    x = 1,561,549.82/1,145.51
  6. Step 6: Final answer
    x = 1,363.20

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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.