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Finding the Fourth Proportional to 1,307.68, 1,961.43 and 485.71

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Solution

The fourth proportional to 1,307.68, 1,961.43 and 485.71 is: 728.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.68 : 1,961.43 = 485.71 : x
  2. Step 2: Convert to fraction form
    1,307.68/1,961.43 = 485.71/x
  3. Step 3: Cross multiply
    1,307.68x = 1,961.43 × 485.71
  4. Step 4: Simplify right side
    1,307.68x = 952,686.17
  5. Step 5: Solve for x
    x = 952,686.17/1,307.68
  6. Step 6: Final answer
    x = 728.53

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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.