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Finding the Fourth Proportional to 1,420.89, 1,960.80 and 868.89

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Solution

The fourth proportional to 1,420.89, 1,960.80 and 868.89 is: 1,199.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.89 : 1,960.80 = 868.89 : x
  2. Step 2: Convert to fraction form
    1,420.89/1,960.80 = 868.89/x
  3. Step 3: Cross multiply
    1,420.89x = 1,960.80 × 868.89
  4. Step 4: Simplify right side
    1,420.89x = 1,703,719.51
  5. Step 5: Solve for x
    x = 1,703,719.51/1,420.89
  6. Step 6: Final answer
    x = 1,199.05

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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.