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Finding the Fourth Proportional to 1,420.32, 1,960.08 and 860.70

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Solution

The fourth proportional to 1,420.32, 1,960.08 and 860.70 is: 1,187.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.32 : 1,960.08 = 860.70 : x
  2. Step 2: Convert to fraction form
    1,420.32/1,960.08 = 860.70/x
  3. Step 3: Cross multiply
    1,420.32x = 1,960.08 × 860.70
  4. Step 4: Simplify right side
    1,420.32x = 1,687,040.86
  5. Step 5: Solve for x
    x = 1,687,040.86/1,420.32
  6. Step 6: Final answer
    x = 1,187.79

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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.