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Finding the Fourth Proportional to 1,580.76, 2,181.47 and 917.37

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Solution

The fourth proportional to 1,580.76, 2,181.47 and 917.37 is: 1,265.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,580.76 : 2,181.47 = 917.37 : x
  2. Step 2: Convert to fraction form
    1,580.76/2,181.47 = 917.37/x
  3. Step 3: Cross multiply
    1,580.76x = 2,181.47 × 917.37
  4. Step 4: Simplify right side
    1,580.76x = 2,001,210.55
  5. Step 5: Solve for x
    x = 2,001,210.55/1,580.76
  6. Step 6: Final answer
    x = 1,265.98

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1.5x scale

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.