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Finding the Fourth Proportional to 1,145.01, 1,580.05 and 647.75

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Solution

The fourth proportional to 1,145.01, 1,580.05 and 647.75 is: 893.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.01 : 1,580.05 = 647.75 : x
  2. Step 2: Convert to fraction form
    1,145.01/1,580.05 = 647.75/x
  3. Step 3: Cross multiply
    1,145.01x = 1,580.05 × 647.75
  4. Step 4: Simplify right side
    1,145.01x = 1,023,477.39
  5. Step 5: Solve for x
    x = 1,023,477.39/1,145.01
  6. Step 6: Final answer
    x = 893.86

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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.