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Finding the Fourth Proportional to 1,145.21, 1,580.45 and 647.87

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Solution

The fourth proportional to 1,145.21, 1,580.45 and 647.87 is: 894.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.21 : 1,580.45 = 647.87 : x
  2. Step 2: Convert to fraction form
    1,145.21/1,580.45 = 647.87/x
  3. Step 3: Cross multiply
    1,145.21x = 1,580.45 × 647.87
  4. Step 4: Simplify right side
    1,145.21x = 1,023,915.00
  5. Step 5: Solve for x
    x = 1,023,915.00/1,145.21
  6. Step 6: Final answer
    x = 894.09

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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.