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Finding the Fourth Proportional to 968.80, 1,312.20 and 968.80

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Solution

The fourth proportional to 968.80, 1,312.20 and 968.80 is: 1,312.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.80 : 1,312.20 = 968.80 : x
  2. Step 2: Convert to fraction form
    968.80/1,312.20 = 968.80/x
  3. Step 3: Cross multiply
    968.80x = 1,312.20 × 968.80
  4. Step 4: Simplify right side
    968.80x = 1,271,259.36
  5. Step 5: Solve for x
    x = 1,271,259.36/968.80
  6. Step 6: Final answer
    x = 1,312.20

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.