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Finding the Fourth Proportional to 1,307.21, 1,960.93 and 485.49

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Solution

The fourth proportional to 1,307.21, 1,960.93 and 485.49 is: 728.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.21 : 1,960.93 = 485.49 : x
  2. Step 2: Convert to fraction form
    1,307.21/1,960.93 = 485.49/x
  3. Step 3: Cross multiply
    1,307.21x = 1,960.93 × 485.49
  4. Step 4: Simplify right side
    1,307.21x = 952,009.48
  5. Step 5: Solve for x
    x = 952,009.48/1,307.21
  6. Step 6: Final answer
    x = 728.28

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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.