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Finding the Fourth Proportional to 1,666.32, 2,499.60 and 693.60

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Solution

The fourth proportional to 1,666.32, 2,499.60 and 693.60 is: 1,040.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,666.32 : 2,499.60 = 693.60 : x
  2. Step 2: Convert to fraction form
    1,666.32/2,499.60 = 693.60/x
  3. Step 3: Cross multiply
    1,666.32x = 2,499.60 × 693.60
  4. Step 4: Simplify right side
    1,666.32x = 1,733,722.56
  5. Step 5: Solve for x
    x = 1,733,722.56/1,666.32
  6. Step 6: Final answer
    x = 1,040.45

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1.5x scale

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.