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Finding the Fourth Proportional to 1,680.40, 2,520.59 and 693.77

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Solution

The fourth proportional to 1,680.40, 2,520.59 and 693.77 is: 1,040.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.40 : 2,520.59 = 693.77 : x
  2. Step 2: Convert to fraction form
    1,680.40/2,520.59 = 693.77/x
  3. Step 3: Cross multiply
    1,680.40x = 2,520.59 × 693.77
  4. Step 4: Simplify right side
    1,680.40x = 1,748,697.12
  5. Step 5: Solve for x
    x = 1,748,697.12/1,680.40
  6. Step 6: Final answer
    x = 1,040.65

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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.