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Finding the Fourth Proportional to 985.02, 1,359.25 and 542.86

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Solution

The fourth proportional to 985.02, 1,359.25 and 542.86 is: 749.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.02 : 1,359.25 = 542.86 : x
  2. Step 2: Convert to fraction form
    985.02/1,359.25 = 542.86/x
  3. Step 3: Cross multiply
    985.02x = 1,359.25 × 542.86
  4. Step 4: Simplify right side
    985.02x = 737,872.94
  5. Step 5: Solve for x
    x = 737,872.94/985.02
  6. Step 6: Final answer
    x = 749.10

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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.