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Finding the Fourth Proportional to 985.89, 1,360.47 and 543.78

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Solution

The fourth proportional to 985.89, 1,360.47 and 543.78 is: 750.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.89 : 1,360.47 = 543.78 : x
  2. Step 2: Convert to fraction form
    985.89/1,360.47 = 543.78/x
  3. Step 3: Cross multiply
    985.89x = 1,360.47 × 543.78
  4. Step 4: Simplify right side
    985.89x = 739,796.38
  5. Step 5: Solve for x
    x = 739,796.38/985.89
  6. Step 6: Final answer
    x = 750.38

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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.